3道脱式计算！ 5
3/2×5+3/5×8+3/8×11+……+3/20×23=====7/12-9/20+11/30-13/42+15/56-17/72=====53×19/52=====...
3/2×5+3/5×8+3/8×11+……+3/20×23
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7/12-9/20+11/30-13/42+15/56-17/72
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53×19/52
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7/12-9/20+11/30-13/42+15/56-17/72
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53×19/52
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= 展开
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