12.53+53.172-53.84=53.(12+172-84)=12.100=1200
28.76+13.28+9.28=28.(76+13+9)=28.98=2744
2 mũ x=32
=> x=5
4^x-7=64 => 4^x-7=4^3
=>x-7=3 => x=10
(x+1)^2=25 =>(x+1)^2=5^2
=>x+1=5 => x=4
2^x+2+2^x=40 =>2^x.2^2+2^x=40
=>2^x.(4+1)=40
=>2^x.5=40
2^x=8
=> x=3
( ^ là mũ nha)
Tích cho tớ nha