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b: Ta có: 7x-8=713
nên 7x=721
hay x=103
c: Ta có: x-36:18=12
nên x-2=12
hay x=14
d: Ta có: (x-36):18=12
nên x-36=216
hay x=252
8: \(\left(-4\right)\cdot3\cdot\left(-125\right)\cdot25\cdot\left(-8\right)\)
\(=-4\cdot25\cdot125\cdot8\cdot3\)
\(=-3\cdot100\cdot1000=-300000\)
9: \(-25\cdot8\cdot\left(-125\right)\cdot3\cdot\left(-4\right)\)
\(=-25\cdot8\cdot125\cdot4\cdot3\)
\(=-3\cdot25\cdot4\cdot8\cdot125\)
\(=-3\cdot100\cdot1000=-300000\)
10: \(147\cdot333+233\cdot\left(-147\right)\)
\(=147\left(333-233\right)\)
\(=147\cdot100=14700\)
11: \(-115\cdot27+33\cdot\left(-115\right)\)
\(=\left(-115\right)\left(27+33\right)\)
\(=-115\cdot60=-6900\)
12: \(45\cdot\left(-24\right)+\left(-10\right)\cdot\left(-12\right)\)
\(=-45\cdot2\cdot12+10\cdot12\)
\(=-24\left(45-5\right)\)
\(=-24\cdot40=-960\)
13: \(-\left(-4\right)^2\cdot3^2\cdot\left(-5\right)^3\)
\(=-16\cdot9\cdot\left(-125\right)\)
\(=16\cdot9\cdot125=9\cdot2\cdot8\cdot125=18\cdot1000=18000\)
14: \(2-4+6-8+...-48+50\)
\(=\left(2-4\right)+\left(6-8\right)+...+\left(46-48\right)+50\)
\(=\left(-2\right)+\left(-2\right)+...+\left(-2\right)+50\)
\(=50-2\cdot24=2\)
\(3\cdot\left(x-4\right)=4x-80\)
\(3x-12=4x+80\)
\(3x-12-4x+80=0\)
\(-x+68=0\)
\(-x=-68\)
\(x=68\)
\(6x=39-3^{11}:3^9\)
\(\Rightarrow6x=39-3^2=39-9=30\)
\(\Rightarrow6x=30\)
\(\Rightarrow x=30:6=5\)
Vậy x = 5