128 215 290如何脱式计算?

2025-02-28 07:00:32
推荐回答(3个)
回答1:

=343+290

=633

希望你能采纳

回答2:

128+215+290
=(130-2)+215+(300-10)
=130+215+300-10-2
=345+300-10-2
=645-10-2
=635-2
=633

回答3:

633

请采纳谢谢