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列式计算． 4 5 与 1 4 的差是它们和的几分之几？ 1 4 与 1 3
列式计算． 4 5 与 1 4 的差是它们和的几分之几？ 1 4 与 1 3
2025-03-15 08:53:59
推荐回答（1个）
回答1：
（1）（
4
5
-
1
4
）÷（
4
5
+
1
4
），
=
11
20
÷
21
20
，
=
11
21
；
答：
4
5
与
1
4
的差是它们和的
11
21
．
（2）（
1
4
+
1
3
）×12，
=
1
4
×12+
1
3
×12，
=3+4，
=7；
答：积是7．
（3）设这个数是x，由题意得：
2
3
x-
1
5
x=
1
4
，
7
15
x=
1
4
，
x=
15
28
；
答：这个数是
15
28
．
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