209×115+115×209-230×209用简便方法怎么算?

2024-11-24 21:38:52
推荐回答(2个)
回答1:

=209×(115+115)-230×209
=209×230-230×209
=209×(230-230)
=209×0
=0
望采纳,谢谢

回答2:

209*115+115*209-230*209
=209*(115+115-230)
=209*(230-230)
=0