(2/5+1/3-7/15)*15简便算

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(2/5+1/3-7/15)*15简便算
(2/5+1/3-7/15)*15
简便算

(2/5+1/3-7/15)*15简便算
(2/5+1/3-7/15)*15
=2*3+1*5-7 乘入15
=6+5-7
=11-7
=4

(2/5+1/3-7/15)*15
=2/5*15+1/3*15-7/15*15
=6+5-7
=4