一块梯形麦田的上底是25m，下底是35m，面积是1140m2．高多少米？
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1﹣= ．
1+3= ．
口算 55+37= 80﹣26= 1400﹣800= 2+210= 9+300= 82+0= 1﹣= += ﹣= ．
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= ．
+3= ．
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