1.9×4.5+0.45 怎样才能简便计算
问题描述:
1.9×4.5+0.45 怎样才能简便计算
答
原式=1.9×4.5+4.5×0.1=(1.9+0.1)×4.5=9
答
1.9×4.5+0.45
=1.9×4.5+4.5×0.1
=4.5×(1.9+0.1)
=4.5×2
=9
答
1.9×4.5+0.45
=1.9×4.5+4.5×0.1
=4.5×(1.9+0.1)
=4.5×2
=9