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a) \(60-3.\left(x-2\right)=51\)
\(\Rightarrow3.\left(x-2\right)=60-51=9\)
\(\Rightarrow x-2=9:3=3\)
\(\Rightarrow x=3+2=5\)
b) \(\left(105-x\right):2^5=3^{0+1}=3^1=3\)
\(\Rightarrow\left(105-x\right):32=3\)
\(\Rightarrow105-x=3.32=96\)
\(\Rightarrow x=105-96=9\)
c) \(x+5=20-\left(12-7\right)\)
\(\Rightarrow x+5=20-5\)
\(\Rightarrow x+5=15\)
\(\Rightarrow x=15-5=10\)
60-3(X-2)=51
=>3(X-2)=60-51
=>3(X-2)=9
=>X-2=9:3
=>X-2=3
=>X=3+2
=>X=5
60-3(x-2)=51
60-3.x-3.2=51
3.x-3.2=60-51
3.x-6=9
3.x=9+6
3.x=15
x=15:3
x=5
vậy x=5
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\(a,60-3.\left(x-2\right)=51\)
\(3.\left(x-2\right)=60-51\)
\(3.\left(x-2\right)=9\)
c \(x-2=9:3\)
\(x-2=3\)
\(x=3+2\)
\(x=5\)
\(b,541+\left(218-x\right)=725\)
\(218-x=725-541\)
\(218-x=184\)
\(x=218-184\)
\(x=34\)
\(c,3.\left(5x-13\right)=3^4\)
\(3.\left(5x-13\right)=81\)
\(5x-13=81:3\)
\(5x-13=27\)
\(5x=27+13\)
\(5x=40\)
\(x=8\)
\(d,\left(2x-7\right)-\left(x+135\right)=0\)
\(2x-7-x-135=0\)
\(x-142=0\)
\(x=0+142\)
\(x=142\)
3 x < x - 2>=60 - 51
3x <x -2>=9
x - 2 = 9 : 3
x -2 = 3
x = 3 + 2
x = 5
Vậy x = 5
\(60-3\times(x - 2)=51\)
\(3\times(x-2)=60-51\)
\(3\times(x-2)=9\)
\(x-2=9:3\)
\(x-2=3\)
\(x=3+2\)
\(x=5\)