简便计算(4.6-3.2)×11.5=1.4x11.5=0.7x2x11.5=0.7x23=16.1
原式=1.4x11.5=0.7x2x11.5=0.7x23=16.1
(4.6-3.2)×11.5=1.4×11.5=0.7×(2×11.5)=0.7×23=16.1