56.9ᘧ࿾9.9锧56.9简便方法?

2024-11-23 03:42:48
推荐回答(4个)
回答1:

乘法分配律稍微简单点
56.9✖️9.9➕56.9
=56.9x(9.9+1)
=56.9x10.9
=56.9x(10+1-0.1)
=56.9x10+56.9-5.69
=620.21
望采纳,谢谢

回答2:

简便解法:
56.9×9.9+56.9
=56.9×(10-0.1)+56.9
=56.9×10-56.9×0.1+56.9
=569-5.69+56.9
=620.21

回答3:

56.9×9.9+56.9
=56.9×(10—0.1)+56.9
=56.9×10—56.9×0.1+56.9
=569+5.69+56.9
=631.59

回答4:

56.9*9.9+56.9
=56.9*(10-0.1)+56.9
=569-5.69+56.9
=569+(56.9-5.69)
=569+51.21
=620.21