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用简便方法计算下面各题.27×45+57×4559×7+11÷95813÷7+17×51315×67-67.
题目详情
用简便方法计算下面各题.
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×7+11÷
÷7+
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15×
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2 2 7 7
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4 4 5 5
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×7+11÷
5 5 9 9
9 9 5 5
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×
8 8 13 13
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1 1 7 7
5 5 13 13 15×
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6 6 7 7
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6 6 7 7
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▼优质解答
答案和解析
(1)27×45+57×45=(27+57)×45=1×45=45;(2)59×7+11÷95=59×7+11×59=59×(7+11)=59×18=10;(3)813÷7+17×513=813×17+17×513=(813+513)×17=1×17=17;(4)15×67-67=(15-1)×67=14×...
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