(-5/8)x(-4)②-0.25x(-5)x(-4)③圆圈里的是平方,

问题描述:

(-5/8)x(-4)②-0.25x(-5)x(-4)③
圆圈里的是平方,

这么难,

(-5/8)x(-4)②-0.25x(-5)x(-4)③
=(-5/8)x(-4)②--0.25x(-5)x(-4)x(-4)②
=(-5/8)x(-4)②--5x(-4)②
=(-5/8-5)x(-4)②
=(-45/8)x16
= -90