43×21 57×21简便计算?

2025-03-05 10:47:55
推荐回答(2个)
回答1:

简便计算
43×21 +57×21
=(43+57)x21
=100x21
=2100

回答2:

43×21+57×21
=21×(43+57)
=21×100
=2100