(3/4)*0.72^2=_______
(-2/3*10^3)^2*(1.5*10^4)^2=__________
9^x=27怎么解，不要只给个结果
參考答案:(3/4)*0.72^2=_______
3/4*0.72*0.72
=3*0.18*0.72
=0.54*0.72
=0.3888
(-2/3*10^3)^2*(1.5*10^4)^2=__________
=(-2/3*10^3)^2*(3/2*10^4)^2
=4/9*10^6*9/4*10^8
=4/9*9/4*10^6*10^8
=10^6*10^8
=10^14
9^x=27
(3^2)^x=3^3
3^2x=3^3
2x=3
x=3/2