巧算 2.5x7.8＋7.4x7.8+0.78 100-99.89+9.09-0.11
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巧算2.5x7.8＋7.4x7.8+0.78100-99.89+9.09-0.11巧算2.5x7.8＋7.4x7.8+0.78100-99.89+9.09-0.11巧算2.5x7.8＋7.4x7.8+
巧算 2.5x7.8＋7.4x7.8+0.78 100-99.89+9.09-0.11
巧算 2.5x7.8＋7.4x7.8+0.78 100-99.89+9.09-0.11
巧算 2.5x7.8＋7.4x7.8+0.78 100-99.89+9.09-0.11
100-(99.89+9.09+0.11)
2.5x7.8+7.4x7.8+0.78
巧算 2.5x7.8＋7.4x7.8+0.78 100-99.89+9.09-0.11
2.5X7.8＋7.4X7.8十0.78怎样简便算,98X99呢
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8x-6x7=18
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7.09x10.8—0.8x7.09简便计算
简便计算.7/8x11/9+87.5%x7/9
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