1200 : 24 - (17 - x) = 36
50 - (17 - x) = 36
17 - x = 50 - 36
17 - x = 14
x = 17 - 14
x = 3
b) 9 . (x + 5) = 729
x + 5 = 729 : 9
x + 5 = 81
x = 81 - 5
x = 76
\(1200:24-\left(17-x\right)=36\)
\(\Rightarrow50-\left(17-x\right)=36\)
\(\Rightarrow17-x=50-36\)
\(\Rightarrow17-x=14\)
\(\Rightarrow x=17-14\)
\(\Rightarrow x=3\)
Vậy x = 3
\(9.\left(x+5\right)=729\)
\(\Rightarrow x+5=729:9\)
\(\Rightarrow x+5=81\)
\(\Rightarrow x=81-5\)
\(\Rightarrow x=76\)
Vậy x = 76
\(1200:24-\left(17-x\right)=36\)
\(50-\left(17-x\right)=36\)
\(17-x=50-36\)
\(17-x=14\)
1200÷24-(17-x)=36
50-(17-x)=36
17-x=50-36
17-x=14
x=17-14
x=3
9×(x+5)=729
x+5=729÷9
x+5=81
x=81-5
x=76
