1.6x(-1又4/5)(-2.5)X(-3/8)

问题描述:

1.6x(-1又4/5)(-2.5)X(-3/8)

原式=1.6×(-1又4/5)(-2.5)×(-3/8)
=8/5×(-9/5)×(-5/2)×(-3/8)
= -(8/5×5/2×3/8)
= -3/2