28×21+28×29递等式怎么算?

2024-12-01 17:15:16
推荐回答(2个)
回答1:

递等式计算过程方法如下

解:28×21+28×29
=28×(21+29)
=28×50
=1400

回答2:

28×21+28×29
=28×(21+29)
=28×50
=1400