a, \(219-7\left(X+1\right)=100\)
\(\Rightarrow219-7X-7=100\)
\(\Rightarrow7X=219-7-100=112\)
\(\Rightarrow X=112:7=16\)
b,\(\left(3X-6\right)x3=3^4\)
\(\Rightarrow3X-6=81:3=27\)
\(\Rightarrow3X=27+6=33\)
\(\Rightarrow X=33:3=11\)
c,\(3636:\left(12X-91\right)=36\)
\(\Rightarrow12X-91=3636:36=101\)
\(\Rightarrow12X=101+91=192\)
\(\Rightarrow X=192:12=16\)
Đúng luôn nên...hằng ngày k cho mk 3 lần, bao h đủ 100 lần thì tui nhé