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116问答网 > 2⼀11+2⼀15+1⼀19+1⼀7等于多少分数？

2⼀11+2⼀15+1⼀19+1⼀7等于多少分数？

2025-04-07 11:00:04

推荐回答（2个）

回答1：

通分，分母相乘，11×15×19×7=21945，分子通分后相加，2×15×19×7=3990，2×11×19×7=2926，1×11×15×7=1155，1×11×15×19=3135，3990+2926+1155+3135=11206，11206÷21945=0.510640237

回答2：

原式=(2×15×19×7+2×11×19×7+11×15×7+19×15×11)/(11×15×19×7)
=(3990+2926+1155+3135)/21945
=10606/21945

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