(-1.25)×(-2/5)×(+8)-9÷(-1 1/2)^2

问题描述:

(-1.25)×(-2/5)×(+8)-9÷(-1 1/2)^2

(-1.25)×(-2/5)×(+8)-9÷(-1 1/2)^2
=1.25*8*2/5-9/(-3/2)^2
=10*2/5-9/(9/4)
=4-4
=0