（-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