( b x 1 - b : 1 ) x ( b x 32 )
( 135 + 15 x 4 ) x ( b x 15 -b x 7 - b x 8 )
NN
Những câu hỏi liên quan
1,Tính giá trị biểu thức
a, 13 . 17 - 256 : 16 + 14 : 7 - 1
b, 15 . 24 - 14 . 5 . (145 : 5 - 27)
c, 15 . 8 - (17 - 30 + 83) - 144 : 6
d,18 - 4 . (27 - 90 + 73) : 10
2,Tìm x
a, 315 - (135 - x)=215
b, x - 320 : 32 = 25 . 16
c, 3 . x - 2018 : 2 = 23
d, 280 - 9 . x - x = 80
e, 38 . x - 12 . x - x . 16 = 40
Giúp mình với nhé,mình đang cần gấp !!
2,
a) \(315-\left(135-x\right)=215\)
\(\Rightarrow135-x=315-215\)
\(\Rightarrow135-x=100\)
\(\Rightarrow x=135-100\)
\(\Rightarrow x=35\)
b) \(x-320:32=25\cdot16\)
\(\Rightarrow x-10=5^2\cdot4^2\)
\(\Rightarrow x-10=20^2\)
\(\Rightarrow x-10=400\)
\(\Rightarrow x=410\)
c) \(3\cdot x-2018:2=23\)
\(=3\cdot x-1009=23\)
\(\Rightarrow3\cdot x=1032\)
\(\Rightarrow x=1032:3\)
\(\Rightarrow x=344\)
d) \(280-9\cdot x-x=80\)
\(\Rightarrow280-x\cdot\left(9+1\right)=80\)
\(\Rightarrow280-10\cdot x=80\)
\(\Rightarrow10\cdot x=280-80\)
\(\Rightarrow10\cdot x=200\)
\(\Rightarrow x=20\)
e) \(38\cdot x-12\cdot x-x\cdot16=40\)
\(\Rightarrow x\cdot\left(38-12-16\right)=40\)
\(\Rightarrow x\cdot10=40\)
\(\Rightarrow x=40:10\)
\(\Rightarrow x=4\)
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Tìm x ,biết A,2.x(x+1)-135=-200 B,4.x-5.(x-1)+15=13 C,2/3.x-1/4=3/5-7/8 D,1/2.(2.x-3)+105/2=-137/2
a: 2x(x+1)-135=-200
=>2(x^2+x)=-65
=>2x^2+2x+65=0
=>x^2+x+32,5=0
=>x^2+x+0,25+32,25=0
=>(x+0,5)^2+32,25=0(vô lý)
b: 4x-5(x-1)+15=13
=>4x-5x+5=-2
=>5-x=-2
=>x=5+2=7
c: 2/3x-1/4=3/5-7/8
=>2/3x=3/5-7/8+1/4=24/40-35/40+10/40=-1/40
=>x=-1/40:2/3=-1/40*3/2=-3/80
d: 1/2(2x-3)+105/2=-137/2
=>1/2(2x-3)=-137/2-105/2=-242/2=-121
=>2x-3=-242
=>2x=-239
=>x=-239/2
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Tìm số nguyên x, biết:
a, x - 32 + 11 = 21 - 33 + 7
b, -2.(x+6) + 6. ( x-10)= 8
c, 7 . x .( 2 + x ) - 7 . x .( x+3) = 14
d, -4 . ( 2x+9) - (-8+3) -( x + 13 ) = 0
e, / 2x - 1 / = 15
a, x - 32 + 11 = 21 - 33 + 7
\(\Rightarrow x-32+11-21+33-7=0\)
\(\Rightarrow x-21-21+33-7=0\)
\(\Rightarrow x-42+33-7=0\)
\(\Rightarrow x-9-7=0\)
\(\Rightarrow x-15=0\)
\(\Rightarrow\)\(x=15\)
Vậy: \(x=15\)
Chúc bạn học tốt :)
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b, -2.(x+6) + 6. ( x-10)= 8
\(\Rightarrow-2x-12+6x-60-8=0\)
\(\Rightarrow4x-80=0\)
\(\Rightarrow4x=80\)
\(\Rightarrow x=\frac{80}{4}=20\)
Chúc bạn học tốt !!!
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Bài 1 : Tìm x
1/-(-30)-(-x)=-(+13)
2/ -(+12)-(+x)=-(+13)
3/ (-34)-x=-(-45)
4/-(-x)+(-15)=(-12)
5/-15-x=-(-7)
Bài 2 : Tính
1/ (-15)-/-10/+/-9/-/-5/
2/14-(-13)-(-21)+(-32)
3/(-12)-(-17)-(-21)+(-32)
4/-/-14/ + /-10/-(-12)+(-8)
5/-(-11)+(-15)+(+13)-21
giúp mình với mình đang cần gấp !!!!!
Bài 1 : Tìm x
1/-(-30)-(-x)=-(+13)
⇒30+x=-13
⇒x=-13-30
⇒x=-43
2/ -(+12)-(+x)=-(+13)
⇒-12-x=-13
⇒x=-12+13
⇒x=1
3/ (-34)-x=-(-45)
⇒x=-34-45
⇒x=-79
4/-(-x)+(-15)=(-12)
⇒x-15=-12
⇒x=-12+15
⇒x=3
5/-15-x=-(-7)
⇒x=-15-7
⇒x=-22
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Bài 2 : Tính
1/ (-15)-/-10/+/-9/-/-5/
=-15-10+9-5
=-21
2/14-(-13)-(-21)+(-32)
=14+13+21-32
=16
3/(-12)-(-17)-(-21)+(-32)
= -12+17+21-32
=-6
4/-/-14/ + /-10/-(-12)+(-8)
=-14+10+12-8
=0
5/-(-11)+(-15)+(+13)-21
=11-15+13-21
=-12
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tim x:
a, x/4 + x/8 + x/16 + x/32 + x/64 + x/178=63/128
b, x* (2/5+2/15+2/125+2/135+2/405)=424/405
bài1: tính nhanh
a, 89 + ( -36 ) + ( -8 ) + 29 + 15 + ( -34 )
b, -195 . 56 -43 . 195 - 195
c, 135 . ( -12 + 147 ) - 147 . ( 135 - 12 )
bài 2 : tìm x
a, 3-(17-x) = -12
b, -26-(x-7)= 0
c, /x+3/-7=13
d, /x-7/+15=23
e, (x+2)(x+3)=0
g, (x-1)( x^2+1)=0
b) -26 - ( x - 7 ) = 0
x - 7 = -26 - 0
x - 7 = -26
x = -26 + 7
x = -19
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Bài 2 :
a) 3 - ( 17 - x ) = -12
( 17 - x ) = 3 - ( -12 )
( 17 - x ) = 15
x = 17 - 15
x = 2
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b) -26 - ( x - 7)=0
x - 7 = -26 -0
x - 7 = -26
x = -26 + 7
x = -19
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Bài 1: Tìm x , biết:
1) x - 2 -6 12) 3 . | x - 1 | - 5 7
2) -5 . x - ( -3 ) 13 13) -12 . ( x - 5 ) + 7 . ( 3 - x ) 5
3) 15 - ( x - 7 ) -21 14) ( x - 2 ) . ( x + 4 ) 0
4) 3 .x + 17 2...
Đọc tiếp
Bài 1: Tìm x , biết:
1) x - 2 = -6 12) 3 . | x - 1 | - 5 = 7
2) -5 . x - ( -3 ) = 13 13) -12 . ( x - 5 ) + 7 . ( 3 - x ) = 5
3) 15 - ( x - 7 ) = -21 14) ( x - 2 ) . ( x + 4 ) = 0
4) 3 .x + 17 = 2 15) ( x - 2 ) . ( x + 15 ) = 0
5) 45 - ( x - 9 ) = -35 16) ( 7 - x ) . ( x + 19 ) = 0
6) ( -5 ) + x = 15 17) -5 < x < 1
7) 2 . x - ( -17 ) = 15 18) | x | < 3
8) | x - 2 | = 3 19) ( x - 3 ) . ( x - 5 ) < 0
9) | x - 3 | - 7 = 13 20) 2 . x2 - 3 = 29
10) 72 - 3 . | x + 1 | = 9 21) -6 . x - ( -7) = 25
11) 17 - ( 43 - | x | ) = 45 22) 46 =- ( x - 11 ) = -48
1) x - 2 = -6
x = -6 + 2
x = -4
2) -5 . x - ( -3 ) =13
-5 . x = 13 + ( -3 )
-5 . x = 10
x = 10 : ( -5 )
x = -2
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tìm x :a, x . dfrac{-5}{8} dfrac{15}{32} b, dfrac{3}{10} : x dfrac{-9}{20}c, dfrac{-1}{4} x + dfrac{4}{5} dfrac{3}{4} d, dfrac{-7}{8} + dfrac{2}{3} :x dfrac{3}{5} . dfrac{-5}{12}
Đọc tiếp
tìm x :
a, x . \(\dfrac{-5}{8}\) = \(\dfrac{15}{32}\) b, \(\dfrac{3}{10}\) : x =\(\dfrac{-9}{20}\)
c, \(\dfrac{-1}{4}\) x + \(\dfrac{4}{5}\) =\(\dfrac{3}{4}\) d, \(\dfrac{-7}{8}\) + \(\dfrac{2}{3}\) :x = \(\dfrac{3}{5}\) . \(\dfrac{-5}{12}\)
\(a,x.\dfrac{-5}{8}=\dfrac{15}{32}\)
\(\Leftrightarrow x=\dfrac{15}{32}:\dfrac{-5}{8}\)
\(\Leftrightarrow x=\dfrac{15}{32}.\dfrac{-8}{5}\)
\(\Leftrightarrow x=-\dfrac{3}{4}\)
\(b,\dfrac{3}{10}:x=-\dfrac{9}{20}\)
\(\Leftrightarrow x=\dfrac{3}{10}:\dfrac{-9}{20}\)
\(\Leftrightarrow x=\dfrac{3}{10}.\dfrac{-20}{9}\)
\(\Leftrightarrow x=-\dfrac{2}{3}\)
\(c,-\dfrac{1}{4}x+\dfrac{4}{5}=\dfrac{3}{4}\)
\(\Leftrightarrow-\dfrac{1}{4}x=\dfrac{3}{4}-\dfrac{4}{5}\)
\(\Leftrightarrow-\dfrac{1}{4}x=-\dfrac{1}{20}\)
\(\Leftrightarrow x=-\dfrac{1}{20}\times\left(-4\right)\)
\(\Leftrightarrow x=\dfrac{1}{5}\)
\(d,-\dfrac{7}{8}+\dfrac{2}{3}:x=\dfrac{3}{5}.\dfrac{-5}{12}\)
\(\Leftrightarrow-\dfrac{7}{8}+\dfrac{2}{3}:x=-\dfrac{1}{4}\)
\(\Leftrightarrow\dfrac{2}{3}:x=-\dfrac{1}{4}+\dfrac{7}{8}\)
\(\Leftrightarrow\dfrac{2}{3}:x=\dfrac{5}{8}\)
\(\Leftrightarrow x=\dfrac{2}{3}:\dfrac{5}{8}\)
\(\Leftrightarrow x=\dfrac{16}{15}\)
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a, \(x\cdot\dfrac{-5}{8}=\dfrac{15}{32}\)
\(x=\dfrac{15}{32}:\dfrac{-5}{8}\)
\(x=\dfrac{-3}{4}\)
b, \(\dfrac{3}{10}:x=\dfrac{-9}{20}\)
\(x=\dfrac{3}{10}:\dfrac{-9}{20}\)
\(x=-\dfrac{2}{3}\)
c, \(\dfrac{-1}{4}x+\dfrac{4}{5}=\dfrac{3}{4}\)
\(\dfrac{-1}{4}x=\dfrac{3}{4}-\dfrac{4}{5}\)
\(\dfrac{-1}{4}x=-\dfrac{1}{20}\)
\(x=-\dfrac{1}{20}:\dfrac{-1}{4}\)
\(x=\dfrac{1}{5}\)
d, \(\dfrac{-7}{8}+\dfrac{2}{3}:x=\dfrac{3}{5}\cdot\dfrac{-5}{12}\)
\(\dfrac{-7}{8}+\dfrac{2}{3}:x=-\dfrac{1}{4}\)
\(\dfrac{2}{3}:x=-\dfrac{1}{4}+\dfrac{-7}{8}\)
\(\dfrac{2}{3}:x=\dfrac{5}{8}\)
\(x=\dfrac{2}{3}:\dfrac{5}{8}\)
\(x=\dfrac{16}{15}\)
#YVA6
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\(a,x.\dfrac{-5}{8}=\dfrac{15}{32} \)
\(x=\dfrac{15}{32}:\dfrac{-5}{8}\)
\(x=\dfrac{-3}{4}\)
\(b,\dfrac{3}{10}:x=\dfrac{-9}{20}\)
\(x=\dfrac{3}{10}:\dfrac{-9}{20}\)
\(x=\dfrac{-2}{3}\)
\(c,\dfrac{-1}{4}.x+\dfrac{4}{5}=\dfrac{3}{4}\)
\(\dfrac{-1}{4}.x=\dfrac{-1}{20}\)
\(x=\dfrac{-1}{20}:\dfrac{-1}{4}\)
\(x=\dfrac{1}{5}\)
\(d,\dfrac{-7}{8}+\dfrac{2}{3}:x=\dfrac{3}{5}.\dfrac{-5}{12}\)
\(\dfrac{-7}{8}+\dfrac{2}{3}:x=\dfrac{-1}{4}\)
\(\dfrac{2}{3}:x=\dfrac{5}{8}\)
\(x=\dfrac{16}{15}\)
\(#yH\)
\(#NBaoNgoc\)
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a)234 x 4 + 234 x 5 + 234
b)135 x16 - 135 x 2 - 4 x 135
c) 1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64
a,234.4+234.5+234=234(4+5+1)=234.10=2340
b,135.16-135.2-135.4=135(16-4-2)=135.10=1350
c,1/2+1/4+1/8+1/16+1/32+1/64=1-1/2+1/2-1/4+1/4-1/8+1/8-1/16+1/16-1/32=1-1/32=31/32
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a) 234 x4 + 234 x 5 + 234 = 234 x ( 1+4+5)=2340
b)135 x16 -135 x2 -4 x135 =135 x (16-2-4) =1350
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a) 234.(4+5+1)=234.10=2340
b)135.(16-2-4)=135.10=1350
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