Simple calculation: 8 / 3.14 × 15 + 7 / 3.14 × 15-3.14

3.14 × 8 / 15 + 3.14 × 7 / 15-3.14
=3.14*（8/15+7/15-1）
=3.14*（1-1）
=3.14*0
=0

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