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8 and 4 / 5 △ [87 + 0.625 × (2 and 3 / 4-1.15)] =8.8÷[87+0.625×(2.75-1.15)] =8.8÷[87+0.625×1.6] =8.8÷[87+1] =8.8÷88 =0.1
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