(1/15+1/16)*15*16
=1/15*15*16+1/16*15*16
=16+15
=31
5/17×3/8+1/15×7/16+1/15×3 1/2=5/17×3/8+7/15×16 1+7/15×1/2=5 /17×3/8+7/15×(1/16+1/2)=5/17×3/8+15 7/16×9/16=5/17×3/8+7/5× 3/16=5/17×3/8+7/10×3/8=8 3/8×(5/17+7/10)=3/8×(50/170+119/170)=3 /8×169/170=507/1360 请验证标题数据
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