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135 - 5 ( x + 4 ) = 35
5 ( x + 4 ) = 135 - 35 = 100
5 ( x + 4 ) = 100 : 5 = 20
x = 20 - 4
x = 16
135 - 5 ( x + 4 ) = 35
5 ( x + 4 ) = 135 - 35
5 ( x + 4 ) = 100
x + 4 = 100 : 5
x + 4 = 20
x = 20 - 4
x = 16
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135-5(x+4)=35
5(x+4)=1355-35=100
x+4=100:5=20
x =20-4=16
ai k mình mình k lại
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a: =-3/24-40/24
=-43/24
b: \(=\dfrac{6}{54}\cdot\dfrac{49}{35}=\dfrac{1}{9}\cdot\dfrac{7}{5}=\dfrac{7}{45}\)
c: \(=\dfrac{6}{5}+\dfrac{4}{3}=\dfrac{18+20}{15}=\dfrac{38}{15}\)
d: \(=\dfrac{31}{17}-\dfrac{14}{17}-\dfrac{5}{13}-\dfrac{8}{13}=1-1=0\)
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a, 32 x 35 + 32 x 65 b, 150 : [ 25 x ( 18- 42)]
= 32 x ( 35 +65) = 150 : [ 25 x ( 18-16)]
= 9 x 100 = 150 : ( 25 x 2)
= 900 = 150 : 50 = 3
c, 57 : 54 - 21 x 22
= 53- 2 x 4
= 125-8
=117
a) 3 ^ 2 x 35 + 3 ^ 2 x 65 = 9 x 35 + 9 x 65 = 9 x ( 65 + 35 ) = 9 x 100 = 900
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Bài 2:
Ta có: \(16x+40=10\cdot3^2+5\left(1+2+3\right)\)
\(\Leftrightarrow16x+40=90+30\)
\(\Leftrightarrow16x=80\)
hay x=5
Bài 5:Thực hiện phép tính:
a)-(-129)+315+(-129)-215
b)(-25).(-38).8.(-125).(-4)
c)12.(35+18)-18.(12-35)
![](https://rs.olm.vn/images/avt/0.png?1311)
a. -(-129) + 315 + (-129) - 215
= 129 + (-129) + (315 - 215)
= 0 + 100
= 100
b. (-25).(-38).8.(-125).(-4)
= [ (-25).(-4) ] . [ (-125).8 ] . (-38)
= 100 . (-1000) . (-38)
= 3800000
c. 12.(35 + 18) - 18.(12 - 35)
= 12.35 + 12.18 - 18.12 + 18.35
= 12.35 + 18.35 + 12.18 - 18.12
= 35 . (12 + 18) + 0
= 35 . 30
= 1050
135-5(x+4)=35)
5(4+x)=135-35
5(4+x)=100
4+x=100:5
4+x =20
x=20-4
x=16
x=
135 - 5(x + 4) = 35
5(x + 4) = 135 - 35
5(x + 4) = 100
x + 4 = 100 : 5
x + 4 = 20
x = 20 - 4
x = 16