Tìm x :( x + 3 ) + ( x + 5 )+(x+7)...(x+25) = 204
x : 1 + x : 5 + x : 0,25 + x : 0,125 =60
NT
Những câu hỏi liên quan
Tìm x biết
d) 32%-0,25:x=-17/5
e)(x+1/5)^2+17/25=26/25
f)-32/27-(3x-7/9)^3=-24/27
g)60%x+0,4x+x:3=2
h)|20/9-x|=1/12+1/20+1/30+1/42+1/56+1/72
i)8/5+(2/7+2/17+2/37/5/7+5/17+5/37).x=16/5
Lưu ý: câu i 2/7+2/17+2/37 phần(vế trên) 5/7+5/17+5/37(vế dưới)
d) Ta có: \(32\%-0.25:x=-\dfrac{17}{5}\)
\(\Leftrightarrow0.25:x=\dfrac{8}{25}+\dfrac{17}{5}=\dfrac{93}{25}\)
hay \(x=\dfrac{25}{372}\)
Vậy: \(x=\dfrac{25}{372}\)
e) Ta có: \(\left(x+\dfrac{1}{5}\right)^2+\dfrac{17}{25}=\dfrac{26}{25}\)
\(\Leftrightarrow\left(x+\dfrac{1}{5}\right)^2=\dfrac{9}{25}\)
\(\Leftrightarrow\left[{}\begin{matrix}x+\dfrac{1}{5}=\dfrac{3}{5}\\x+\dfrac{1}{5}=-\dfrac{3}{5}\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{2}{5}\\x=-\dfrac{4}{5}\end{matrix}\right.\)
Vậy: \(x\in\left\{\dfrac{2}{5};-\dfrac{4}{5}\right\}\)
f) Ta có: \(-\dfrac{32}{27}-\left(3x-\dfrac{7}{9}\right)^3=-\dfrac{24}{27}\)
\(\Leftrightarrow\left(3x-\dfrac{7}{9}\right)^3=\dfrac{-8}{27}\)
\(\Leftrightarrow3x-\dfrac{7}{9}=-\dfrac{2}{3}\)
\(\Leftrightarrow3x=\dfrac{1}{9}\)
hay \(x=\dfrac{1}{27}\)
g) Ta có: \(60\%\cdot x+0.4x+x:3=2\)
\(\Leftrightarrow\dfrac{4}{3}x=2\)
hay \(x=\dfrac{3}{2}\)
Vậy: \(x=\dfrac{3}{2}\)
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h) PT \(\Leftrightarrow\left|\dfrac{20}{9}-x\right|=\dfrac{2}{9}\) \(\Rightarrow\left[{}\begin{matrix}\dfrac{20}{9}-x=\dfrac{2}{9}\\x-\dfrac{20}{9}=\dfrac{2}{9}\end{matrix}\right.\) \(\Leftrightarrow\left[{}\begin{matrix}x=2\\x=\dfrac{22}{9}\end{matrix}\right.\)
Vậy ...
i) PT \(\Leftrightarrow\dfrac{8}{5}+\dfrac{2}{5}x=\dfrac{16}{5}\) \(\Leftrightarrow\dfrac{2}{5}x=\dfrac{8}{5}\) \(\Leftrightarrow x=4\)
Vậy ...
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TÍNHfrac{1+0,6-frac{3}{7}}{frac{8}{3}+frac{8}{5}-frac{8}{7}}-frac{frac{1}{3}+0,25-frac{1}{5}+0,125}{frac{7}{6}+frac{7}{8}-0,7+frac{7}{16}}TÌM Xa) frac{59-x}{41}+frac{57-x}{43}+frac{55-x}{45}+frac{53-x}{47}+frac{51-x}{49}-5b) frac{x-5}{1990}+frac{x-15}{1980}+frac{x-25}{1970}frac{x-1990}{5}+frac{x-1980}{15}+frac{x-1570}{25}CÁC BẠN GIÚP MK NHÉ! CẢM ƠN CÁC BẠN NHÌU NHA!
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TÍNH
\(\frac{1+0,6-\frac{3}{7}}{\frac{8}{3}+\frac{8}{5}-\frac{8}{7}}-\frac{\frac{1}{3}+0,25-\frac{1}{5}+0,125}{\frac{7}{6}+\frac{7}{8}-0,7+\frac{7}{16}}\)
TÌM X
a) \(\frac{59-x}{41}+\frac{57-x}{43}+\frac{55-x}{45}+\frac{53-x}{47}+\frac{51-x}{49}=-5\)
b) \(\frac{x-5}{1990}+\frac{x-15}{1980}+\frac{x-25}{1970}=\frac{x-1990}{5}+\frac{x-1980}{15}+\frac{x-1570}{25}\)
CÁC BẠN GIÚP MK NHÉ! CẢM ƠN CÁC BẠN NHÌU NHA!
\(\frac{1+0,6-\frac{3}{7}}{\frac{8}{3}+\frac{8}{5}-\frac{8}{7}}=\frac{\frac{3}{3}+\frac{3}{5}-\frac{3}{7}}{\frac{8}{3}+\frac{8}{5}-\frac{8}{7}}=\frac{3.\left(\frac{1}{3}+\frac{1}{5}-\frac{1}{7}\right)}{8.\left(\frac{1}{3}+\frac{1}{5}-\frac{1}{7}\right)}=\frac{3.1}{8.1}=\frac{3}{8}\)
\(\frac{\frac{1}{3}+0,25-\frac{1}{5}+0,125}{\frac{7}{6}+\frac{7}{8}-0,7+\frac{7}{16}}=\frac{\frac{1}{3}+\frac{1}{4}-\frac{1}{5}+\frac{1}{8}}{\frac{7}{6}+\frac{7}{8}-\frac{7}{10}+\frac{7}{16}}=\frac{1.\left(\frac{1}{3}+\frac{1}{4}-\frac{1}{5}+\frac{1}{8}\right)}{7.\left(\frac{1}{3}+\frac{1}{4}-\frac{1}{5}+\frac{1}{8}\right)}=\frac{1.1}{7.1}=\frac{1}{7}\)
=>\(\frac{3}{8}-\frac{1}{7}=\frac{13}{56}\)
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Xem thêm câu trả lời
bài 1 (-0,125)*7,9*80
(0,125)*15*0,25*8*(-4)
bài 2
x+8/32=1/9
x+8/5=x-2/3
37+x/3=3/7
Bài 1:
\(\left(-0,125\right)\times7,9\times80\)
\(=\left(-0,9875\right)\times80\)
\(=79.\)
\(\left(0,125\right)\times1\times0,25\times8\times\left(-4\right)\)
\(=0,125\times0,25\times8\times\left(-4\right)\)
\(=0,03125\times8\times\left(-4\right)\)
\(=0,25\times\left(-4\right)\)
\(=\left(-1\right).\)
Bài 2:
\(x+\frac{8}{3}^2=\frac{1}{9}\)
\(x+16=\frac{1}{9}\)
\(x=\frac{1}{9}-16.MSC=9\)
\(x=\frac{1}{9}-\frac{144}{9}\)
\(x=\frac{-143}{9}.\)
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x:1+x:0,5+x:0,25+x:0,125=60
x:1+x:0,5+x:0,25+x:0,125=60
x*1+x*2+x*4+x*8=60
x*(1+2+4+8)=60
x*15=60
x =60:15
x =4
k cho minh nhe
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x : ( 1 + 0.5 + 0.25 + 0.125 ) = 60
x : 2.125 = 60
x = 60 x 2.125
x = 127.5
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Tìm x biết
a, 1/7.x = 9/8 - 0,125
b, x - 25% . x = 1/2
c, ( 50%x + 9/4 ) . -2/3 = 17/6
d,( 3x/7 + 1 ) : ( - 4)3 = -1/28
e, (4/3 - 25% - 5/12 ) - 2x = 1,6 : 3/5
a) x=7
b)x=2/3
c)x=-13
d)x=3
e)x=-1
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Bài 1 : Tìm X
a) \(\frac{2xX-4,36}{0,125}=\)0,25 x 42,9 - 11,7 x 0,25 + 0,25 x 0,8
b) 104,5 x X -14,1 x X + 9,6 x X = 25
c) \(\frac{5xX}{x-13}=\)49 x 0,5 - 7 x 0,5 + 0,25
d) 13,44 x X - ( 1,6 + x ) x 0,5 -3,7 x ( x - 0,9 ) = 13, 618
#)Giải :
a) \(\frac{2xX-4,36}{0,125}=\)0,25 x 42,9 - 11,7 x 0,25 + 0,25 x 0,8
\(\frac{2xX-4,36}{0,125}=\)0,25 x ( 42,9 - 11,7 + 0,8 )
\(\frac{2xX-4,36}{0,125}=\)0,25 x 32
\(\frac{2xX-4,36}{0,125}=8\)
\(2xX-4,36=8x0,125\)
\(2xX-4,36=1\)
\(2xX=1+4,36\)
\(2xX=5,36\)
\(X=5,36:2\)
\(X=2,68\)
#~Will~be~Pens~#
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#)Next :
b) 104,5 x X - 14,1 x X + 9,6 x X = 25
( 104,5 - 14,1 + 9,6 ) x X = 25
100 x X = 25
X = 25 : 100
X = 0,25
#~Will~be~Pens~#
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b,
104,5.x-14,1.x+9,6.x=25
x(104,5-14,1+9,6)=25
x.100=25
x=25:100
x=0,25
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Xem thêm câu trả lời
Tìm x :
a) 11/4 . x = 22/7 :0,01
b) x : 1/3 = 12/99 : 15/90
c) 4/9 : x = 10/3 : 2,25
d) 0,25.x : 3 = 5/6 : 0,125
a) x=800/7
b) x=8/33
c) x= 3/10
d) x=80
100 % đúng hết
x:1+x:0,5+0,25+x:0,125=60
x:(1+0,5+0,25+0,125)=60
x:1,875=60
x=60x1,875
x=112,5
k mik nhá bn
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x : 1 + x : 0.5 + 0.25 + x : 0.125 = 60
Suy ra :60 - 0.25 = X x 1 + X x 2 + X x 8
59.75 = X x ( 1 + 2 + 8 )
59.75 = X x 11
Suy ra : X x 11 = 59.75
X = 59.75 : 11
X = 5.4318181818.........
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Bài 5: Tính bằng cách thuận tiện nhất:
a) 4,68 x 26 + 0,28 x 2,2 + 4,68 x 74 + 0,22 x 2,2
b) 25 x 25 x 11 x 4 + 4 x 25 x 2 x125
c) 27,85 + 27,85 : 0,5 + 27,85 : 0,25 + 27,85 : 0,2 + 27,85 : 0,125
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