42*1.63+3.6*4.2 简便方法计算,
问题描述:
42*1.63+3.6*4.2 简便方法计算,
答
42*1.63+3.6*4.2
=4.2*16.3+3.6*4.2
=4.2*(16.3+3.6)
=4.2*20
=84