(3/8+4/5-7/10)×40

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(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=

(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