郭浩二分之一加三分之一括住乘以五分之一用简便算法国号1/2+1/3括住乘以1/5，用简便算法怎么算？
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(1/2+1/3)×(1/5)
=［(1×3)/(2×3)+(1×2)/(3×2)］×(1/5)
=(3/6+2/6)×(1/5)
=［(3+2)/6］×(1/5)
=(5/6)×(1/5)
=(5×1)/(6×5)
=5/30
=(5÷5)/(30÷5)
=1/6
≈0.17
=［(1×3)/(2×3)+(1×2)/(3×2)］×(1/5)
=(3/6+2/6)×(1/5)
=［(3+2)/6］×(1/5)
=(5/6)×(1/5)
=(5×1)/(6×5)
=5/30
=(5÷5)/(30÷5)
=1/6
≈0.17
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