25×5 8×35 21×20 14×40,怎样简便计算?

2025-04-23 17:29:59
推荐回答(1个)
回答1:

简便计算
25×5 +8×35 +21×20+ 14×40
=125+20x14+20x21+20x28
=125+20x(14+21+28)
=125+20x63
=125+1260
=1385