4.2×0.3+42×0.07 脱式计算
问题描述:
4.2×0.3+42×0.07 脱式计算
答
4.2×0.3+42×0.07
=4.2×0.3+4.2×0.7
=4.2×(0.3+0.7)
=4.2×1
=4.2