能。
原式=(1/2-1/12)*2/5+1*2/5
=(5/12+1)*2/5
=17/12*2/5
=17/30.
望采纳
不能简便计算
(1/2-1/4÷3)x2/5+2/5
=（1/2-1/12）x2/5+2/5
=5/12x2/5+2/5
=1/6+2/5
=5/30+12/30
=17/30
=（6/12-1/4×3）×2/5+2/5
=5/12×2/5+2/5
=1/6+12/30
=5/30+12/30
=17/30
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