求数学大师解答!【急!13\7-(15\21-1\3)4-(3\4-2\9)3\10+(1\2-4\15)1-2\5-1\312\7-3\5+1\211\6-(3\4+1\3)
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![求数学大师解答!【急!13\7-(15\21-1\3)4-(3\4-2\9)3\10+(1\2-4\15)1-2\5-1\312\7-3\5+1\211\6-(3\4+1\3)](/uploads/image/z/8562115-19-5.jpg?t=%E6%B1%82%E6%95%B0%E5%AD%A6%E5%A4%A7%E5%B8%88%E8%A7%A3%E7%AD%94%21%E3%80%90%E6%80%A5%2113%5C7-%EF%BC%8815%5C21-1%5C3%294-%283%5C4-2%5C9%293%5C10%2B%281%5C2-4%5C15%291-2%5C5-1%5C312%5C7-3%5C5%2B1%5C211%5C6-%283%5C4%2B1%5C3%29)
求数学大师解答!【急!13\7-(15\21-1\3)4-(3\4-2\9)3\10+(1\2-4\15)1-2\5-1\312\7-3\5+1\211\6-(3\4+1\3)
求数学大师解答!【急!
13\7-(15\21-1\3)
4-(3\4-2\9)
3\10+(1\2-4\15)
1-2\5-1\3
12\7-3\5+1\2
11\6-(3\4+1\3)
求数学大师解答!【急!13\7-(15\21-1\3)4-(3\4-2\9)3\10+(1\2-4\15)1-2\5-1\312\7-3\5+1\211\6-(3\4+1\3)
13\7-(15\21-1\3)
=13/7-5/7+1/3
=8/7+1/3
=(24+7)/21
=31/21;
4-(3\4-2\9)
=4-(27/36-8/36)
=4-19/36
=3又36分之17;
3\10+(1\2-4\15)
=9/30+15/30-8/30
=16/30
=8/15;
1-2\5-1\3
=3/5-1/3
=9/15-5/15
=4/15;
12\7-3\5+1\2
=60/35-21/35+1/2
=39/35+1/2
=78/70+35/70
=113/70;
11\6-(3\4+1\3)
=22/12-9/12-4/12
=9/12
=3/4;
如果本题有什么不明白可以追问,
13\7-(15\21-1\3)
=13/7-8/21
=31/21
4-(3\4-2\9)
=4-19/36
=3又17/36
3\10+(1\2-4\15)
=3/10+7/30
=8/15
1-2\5-1\3
=3/5-1/3
=4/15
12\7-3\5+1\2
=39/35+1/2
=113/70
11\6-(3\4+1\3)
=11/6-13/12
=3/4
13\7-(15\21-1\3)
=13/7-(15/21-7/21)
=13/7-8/21
=39/21-8/21
=31/21
4-(3\4-2\9)
=4-(27/36-8/36)
=4-19/36
=3又36/36-19/36
=3又17/36
3\10+(1\2-4\15)
=9/30+(15/30-...
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13\7-(15\21-1\3)
=13/7-(15/21-7/21)
=13/7-8/21
=39/21-8/21
=31/21
4-(3\4-2\9)
=4-(27/36-8/36)
=4-19/36
=3又36/36-19/36
=3又17/36
3\10+(1\2-4\15)
=9/30+(15/30-8/30)
=9/30+7/30
=16/30
=8/15
1-2\5-1\3
=15/15-6/15-5/15
=4/15
12\7-3\5+1\2
=120/70-42/70+35/70
=78/70+35/70
=113/70
11\6-(3\4+1\3)
=22/12-(9/12+4/12)
=22/12-13/12
=9/12
=3/4
收起