\(777\div7-\left(10\times10\right)=x\div9\)
\(111-100=x\div9\)
\(x\div9=111-100\)
\(x\div9=11\)
\(x=11\times9\)
\(x=99\)
Giải:
777 : 7 - (10 . 10) = x : 9
=> 111 - 100 = x : 9
=> x : 9 = 111 - 100
=> x : 9 = 11
=> x = 11 . 9
=> x = 99.
\(777\div7-\left(10\cdot10\right)=x\div9\)
\(\Rightarrow111-100=x\div9\)
\(\Rightarrow11=x\div9\)
\(\Rightarrow x=9\cdot11\)
\(\Rightarrow x=99\)
Vậy x=99