7/15×3/8+1/15×7/16+1/15×3又1/2用简便算法怎么做?
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7/15×3/8+1/15×7/16+1/15×3又1/2用简便算法怎么做?7/15×3/8+1/15×7/16+1/15×3又1/2用简便算法怎么做?7/15×3/8+1/15×7/16+1/15×
7/15×3/8+1/15×7/16+1/15×3又1/2用简便算法怎么做?
7/15×3/8+1/15×7/16+1/15×3又1/2用简便算法怎么做?
7/15×3/8+1/15×7/16+1/15×3又1/2用简便算法怎么做?
7/15×3/8+1/15×7/16+1/15×3又1/2
= 7/15×3/8+7/15×1/16+1/15×7/2
= 7/15×3/8+7/15×1/16+7/15×1/2
=7/15×(3/8+1/16+1/2)
=7/15×15/16
=7/16
先把1/15乘了再说
原式=7/15×3/8+1/15×7/16+1/15×7/2=7/15（3/8+1/16+1/2）=7/15×15/16=7/16
7/15*3/8+1/15*7/16+1/15*3又1/2
简算:7/15×3/8+1/15×7/16+7/2÷15
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