\(66-3\left(x-2\right)=51\)
\(3\left(x-2\right)=66-51\)
\(3\left(x-2\right)=15\)
\(x-2=5\)
\(x=7\)
a.
\(66-3\times\left(x-2\right)=51\)
\(3\times\left(x-2\right)=66-51\)
\(3\times\left(x-2\right)=15\)
\(x-2=\frac{15}{3}\)
\(x-2=5\)
\(x=5+2\)
\(x=7\)
b.
\(4x-20=2^{15}\div2^{12}\)
\(4x-20=2^3\)
\(4x-20=8\)
\(4x=8+20\)
\(4x=28\)
\(x=\frac{28}{4}\)
\(x=7\)
Chúc bạn học tốt
\(4x-20=2^{15}:2^{12}\)
\(4x-20=2^3\)
\(4x=28\)
\(x=7\)