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要简便计算
追答88.8×8.7+11.2×(9.9-1.2)
=88.8×8.7+11.2×8.7
=(88.8+11.2)×8.7
=100×8.7
=870
88.8×8.7+11.2×(9.9-1.2)
=88.8×8.7+11.2×8.7
=(88.8+11.2)×8.7
=100×8.7
=870
500×0.71+11×0.71+11×9.29+500×0.29+25×0.29
=500×(0.71+0.29)+11×(9.29+0.71)+25×0.29
=500+110+7.25
=617.25
500×0.71+11×0.71+11×9.29+500×0.29+25×0.29
=500×(0.71+0.29)+11×(9.29+0.71)+25×0.29
=500+110+7.25
=617.25
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