31/131×63+21/131×38简便计算？
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31/131×63+21/131×38
【提取1/131】
=(31×63+21×38)/131
=[(31x21x3)+(21x38)]/131
【中括号内提取21】
=[(31x3)+38]x21/131
=(93+38)x21/131
=131x21/131
【约分】
=21
【提取1/131】
=(31×63+21×38)/131
=[(31x21x3)+(21x38)]/131
【中括号内提取21】
=[(31x3)+38]x21/131
=(93+38)x21/131
=131x21/131
【约分】
=21
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展开全部
31/131x63+21/131x38
=63/131x31+21/131x38
=21/131x(3x31)+21/131x38
=21/131x93+21/131x38
=21/131x(93+38)
=21/131x131
=21
=63/131x31+21/131x38
=21/131x(3x31)+21/131x38
=21/131x93+21/131x38
=21/131x(93+38)
=21/131x131
=21
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