Tuyển Cộng tác viên Hoc24 nhiệm kì 26 tại đây: https://forms.gle/dK3zGK3LHFrgvTkJ6
a)
\(2x+5.11^0=3^2\)
<=>\(2x+5.1=3^2\)
<=> \(2x=9-5\)
<=> \(2x=4\)
<=> \(x=2\)
Vậy x=2
b)
\(4.\left(3x-13\right)=\dfrac{64}{2^3}\)
<=> \(4\left(3x-13\right)=\dfrac{64}{8}\)
<=> \(4.\left(3x-13\right)=8\)
<=> \(3x-13=2\)
<=> \(3x=15\)
<=> \(x=5\)
Vậy x=5
2x + 5 . 110 = 32
4.( 3x - 13 ) = 64 : 23
Bài 1 : tìm x thuộc N ,biết
a) 82-7(3x-4)=47
b)97+4(5x-7)=129
c)(7x-13)27-12=15
d)(2x+3)13+23=140
đ)52.x+8x-5x=70
e) 19x-3x-x=60
g) 7(3x+1)-5(3x+1)=74
h)5(3x-1)+7(3x-1)=96
Bài 1. Tính hợp lý
1) (–12) +6.(–3)
2) (36 -2020) + (2019 -136) – 27
3) (144 – 97) – (244 – 197)
4) (–24).13 – 24.( –3)
5) 54+55+56+57+58-(64+65+66+67+68)
6) 24(16 – 5) – 16(24 – 5)
7) 47.(23 + 50) – 23.(47 + 50)
8) (-31). 47 + (-31). 52 + (-31)
Bài 2: Tìm số nguyên x, biết:
1)-17-(2x-5)=-6
2) 10-2(4-3x)=-4
3)-12+3(-x+7)=-18
4)-45:[5.(-3-2x)]=3
5) x.(x+3)=0
6) (x-2).(x+4)=0
7) x.(x+1).(x-3)=0
a , 43 + ( 9 - 21 ) = 317 - ( x + 317 )
b , ( 15 - x ) + ( x - 12 ) = 7 - ( -5 + x )
c , x - { 57 - [ 42 + ( -23 - x )]} = 13 - { 47 + [ 25 - ( 32 - x )]}
d , -7 + | x - 4 | = -3
e , 13 - | x + 5 | = 13
g , | x - 10 | - ( -12 ) = 4
h , | x + 2 | < 5
1)6x-8=3x+1
2)12-10x=25-30x
3)3(2x+3)-2(4x-5)=10x+21
4)5(5x-3)-3(2x-4)11-5x
5)4(2-3x)-5(1-2x)=4-6x
6)8(4x-3)-3(2-3x)=13-40x
7)10x-5(1-4x)=5x-11
8)-3(3-4x)-5(4-3x)=12x-50
9)-2(20x-3)-3(4x-5)=9-2(2x-3)
10)-5(2-3x)+3(5-2x)=3x+3(3-5x)
Tìm x
1) -3-(-x) =5
2)-9-(x-3)=12
3)-10-(x-5)=-5
4)210-(10-x) =110
5)4x-(2x-5)=21
6)14x-5=8x+10
7)15+5x =3x+30
8)2x-5=15-3x
9)2(3x+5)+3(x+1)=x+220
10)4.(x-2+5(x-3)=18
Giúp mik vs
Mik cần gấp
Bỏ dấu ngoặc rồi tính:
a) (123 - 27)+ (27+ 13-123); b) (175 + 25 + 13)-(-15 + 175 + 25);
c) (2012 - 119 + 29) - (-119 + 29); d) -(55 - 80 + 91) - (2012 + 80 - 91).
e) 123 + [54 + (-123) + 46]; f) - 64 + [(-110 + 64 + 71].
Bài 13: Tìm x:
1/ (2x – 15) + 17 = 6
2/ 15 – (4 – 3x) = - 4
3/ - 21 + 3(-x + 7) = -18
4/ 78 : (3x – 2) = -3
5/ -35 : 5.(-3 – 2x) = 35
Bài 5.Tìm x N, sao cho:
a)3636 : (12x –91) = 36
b)(x : 23 + 45) . 67 = 8911
c)[(6x –39) : 7]. 4 = 12
d)(3x –24). 73= 2. 74
e)x(x –10) = 0
f)(x+ 1). (x –2) = 0
g)(9 –x)3= 64
h)3x= 81
i)2 . 3x= 10 . 312+ 8 . 312
j)(19x + 2.52) : 14 = (13 -8)2-42