13×21+26×23+39×11这道题用脱式并且提取公因数怎么做?

2025-04-06 09:14:02
推荐回答(1个)
回答1:

13×21+26×23+39×11
=13x21+13x2x23+13x3x11
=13x(21+46+33)
=13x100
=1300