求简便算法 99.9*74+33.3*78
问题描述:
求简便算法 99.9*74+33.3*78
答
99.9*74+33.3*78
=99.9*74+99.9*26
=99.9*(74+26)
=99.9*100
=9990请问答案中的26是怎么来的,而78又去哪了再多一步就明白了33.3×78=33.3×3×26=99.9×26