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a)-12(x-5)+7(3-x)=5
-12x-(-60)+21-7x=5
-12x+60+21-7x=5
-12x-7x=5-60-21
-19x=-76
x=-76/-19
x=4. Vậy x=4
ặc, bạn ghi ít ít thôi, ghi thế này nhiều quá
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
\(\text{-7129+1478+7129+(-1479)}\)
\(=\text{-7129+7129+1478+(-1479)}\)
\(=0-1=-1\)
\(\text{|-5|.(-7)+4.(-9)}\)
\(=\text{5.(-7)+4.(-9)}\)
\(=\left(-35\right)+\left(-36\right)=-71\)
\(1\)) \(5-\left(10-x\right)=7\)
\(10-x=5-7\)
\(10-x=-2\)
\(x=10-\left(-2\right)\)
\(x=12\)
\(2\)) \(-32-\left(x-5\right)=0\)
\(x-5=-32-0\)
\(x-5=-32\)
\(x=-32+5\)
\(x=-27\)
a) x + 2 = - 9 - 11
x + 2 = - 20
x = - 20 - 2
x = - 22
Vậy x = - 22
b) x - 2 = - 6 + 17
x - 2 = 11
x = 11 + 2
x = 13
Vậy x = 13
1) -5x - (-3) = 13
\(\Rightarrow-5x+3=13\)
\(\Rightarrow-5x=10\)
\(\Rightarrow x=-2\)
Vậy: \(x=-2\)
2) 15 - ( x - 7) = -21
\(\Rightarrow15-x+7=-21\)
\(\Rightarrow15+7-x=-21\)
\(\Rightarrow22-x=-21\)
\(\Rightarrow x=-22-21=-43\)
Vậy: \(x=-43\)
3) 45 - ( x - 9) = -35
\(\Rightarrow45-x+9=-35\)
\(\Rightarrow45+9-x=-35\)
\(\Rightarrow54-x=-35\)
\(\Rightarrow x=-54-35=-89\)
Vậy: \(x=-89\)
4)/x-2/=3\(\Rightarrow\)ta có 2 t/h:
t/h1: x-2=3\(\Rightarrow\)x=2+3=5
t/h2: x-2=-3\(\Rightarrow\)x=2+(-3)=-1
Vậy x=5 hoặc -1
\(\left(x+1\right)+\left(x+3\right)+\left(x+5\right)+\left(x+7\right)+\left(x+9\right)+\left(x+11\right)=72\\ x+1+x+3+x+5+x+7+x+9+x+11=72\\ \left(x+x+x+x+x+x\right)+\left(1+3+5+7+9+11\right)=72\\ 6\cdot x+36=72\\ 6\cdot x=72-36\\ 6\cdot x=36\\ x=36:6\\ x=6\)
\(\left(x+1\right)+\left(x+3\right)+\left(x+5\right)+\left(x+7\right)+\left(x+9\right)+\left(x+11\right)=72\)
\(\left(x+x+x+x+x+x\right)+\left(1+3+5+7+9+11\right)=72\)
\(\left(x+x+x+x+x+x\right)+\left[\left(1+9\right)+\left(3+7\right)+\left(5+11\right)\right]=72\)
\(\left(x+x+x+x+x+x\right)+\left[10+10+16\right]=72\)
\(6x+36=72\)
\(6x=72-36\)
\(6x=36\)
\(x=36:6\)
\(x=6\)
Vậy...