a)\(70-5.\left(x-3\right)=45\)
\(5.\left(x-3\right)=70-45\)
\(5.\left(x-3\right)=25\)
\(x-3=25:5\)
\(x-3=5\)
\(x=5+3\)
\(x=8\)
b) \(10+2.x=4^5:4^3\)
\(10+2.x=4^2\)
\(10+2.x=16\)
\(2.x=16-10\)
\(2.x=6\)
\(x=6:2\)
\(x=3\)
Qua
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de cuc lun
rat rat de
noi chung la
qua de lụn
a) 70-5(x-3)=45 b) 10+2.x=4 mux5:.4 mũ3
5(x-3)=70-45 10+2x=4 mũ 2
5(x-3)=25 10+2x=16
x-3=25:5 2x=16-10
2x=6
x-3=5 x=6:2
x=5+3 x=3
x=8
