0.87×1.2+8.7×0.88
=8.7×0.12+8.7×0.88
=8.7×(0.12+0.88)
=8.7×1.0
=8.7
0.87×1.2+8.7×0.88
=0.87×1.2+0.87×8.8
=0.87×(1.2+8.8)
=0.87×10
=8.7
简便计算
0.87×1.2+8.7×0.88
=0.87x1.2+0.87x8.8
=0.87x(1.2+8.8)
=0.87x10
=8.7
0.87×1.2+8.7×0.88=
0.87×1.2+(0.87x10)×0.88=
0.87×1.2+0.87x(10×0.88)=
0.87×1.2+0.87x8.8=
0.87x(1.2+8.8)=0.87x10=8.7