How to simplify the calculation Speed Wuwu, I have to hand it in tomorrow Well, well speed

7/15×3/8+1/15×7/16+1/15×7/2
=7/15（3/8+1/16+1/2）
=7/15（6/16+1/16+8/16）
=7/15×15/16
=7/16

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