(7/23)*3/4-0.75*(4又7/23)-3/2*(-3)

问题描述:

(7/23)*3/4-0.75*(4又7/23)-3/2*(-3)

(7/23)*3/4-0.75*(4又7/23)-3/2*(-3)
=3/4×(7/23-4又7/23)-3/2*(-3)
=3/4×(-4)-3/2×(-3)
=-3-(-9/2)
=-3+9/2
=3/2