简算:7/15×3/8+1/15×7/16+7/2÷15
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简算:7/15×3/8+1/15×7/16+7/2÷15
简算:7/15×3/8+1/15×7/16+7/2÷15
简算:7/15×3/8+1/15×7/16+7/2÷15
7/15×3/8+1/15×7/16+7/2÷15
=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
=7/40+7/240+7/30
=42/240+7/240+56/240
=105/240
=7/16
解;原式=7/15×6/16+1/15×7/16+56/16×1/15
=6×7/15×16+7/15×16+56/15×16
=7/16
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