简便算:79*29+79
问题描述:
简便算:79*29+79
答
79*29+79
=79*(29+1)
=(80-1)*30
=2400-30
=2370
简便算:79*29+79
79*29+79
=79*(29+1)
=(80-1)*30
=2400-30
=2370