第一6.42×1.01-6.42第二80.7×8.7+8.07×13
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![第一6.42×1.01-6.42第二80.7×8.7+8.07×13](/uploads/image/z/189179-35-9.jpg?t=%E7%AC%AC%E4%B8%806.42%C3%971.01-6.42%E7%AC%AC%E4%BA%8C80.7%C3%978.7%2B8.07%C3%9713)
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第一6.42×1.01-6.42第二80.7×8.7+8.07×13
第一6.42×1.01-6.42第二80.7×8.7+8.07×13
第一6.42×1.01-6.42第二80.7×8.7+8.07×13
6.42×1.01-6.42
=6.42x(1.01-1)
=6.42x0.01
=0.0642
80.7×8.7+8.07×13
=8.07x87+8.07x13
=8.07x(87+13)
=8.07x100
=807