用小数表示 1.239*10^ -3 (-0.1)^-1= (-3/2)^-2=

问题描述:

用小数表示 1.239*10^ -3 (-0.1)^-1= (-3/2)^-2=

1.239*10^ -3*(-0.1)^-1=0.001239*(-10)=-0.01239
..
(-3/2)^-2=(2/3)²=4/9≈0.4 (无限循环小数)