(3/8+4/5-7/10)×40

来源:学生作业帮助网 编辑:作业帮 时间:2024/04/30 09:43:09

(3/8+4/5-7/10)×40
(3/8+4/5-7/10)×40

(3/8+4/5-7/10)×40
(3/8+4/5-7/10)×40
=3/8×40+4/5×40-7/10×40
=15+32-28
=19

=3/8×40+4/5×40-7/10×40
=15+32-28
=19

(3/8+4/5-7/10)×40
=3/8×40+4/5×40-7/10×40
=3×5+4×8-7×4
=15+32-28
=19
利用的是乘法分配律