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口算:
1
3
-
1
4
=
3
4
+
5
6
=
5
8
×
24
25
=
2
5
=
25×10%=
2
5
÷10=
25%:
1
8
=
2-
5
12
-
7
12
=
1
6
+
3
4
+
5
6
+
1
4
=
3
5
×
1
16
+
3
5
×
15
16
=
分析:根据分数、百分数的加减乘除法的运算法则进行计算及求比值.
解答:解:
1
3
-
1
4
=
1
12
3
4
+
5
6
=
19
12
5
8
×
24
25
=
3
5
2
5
=2.5
25×10%=
5
2
2
5
÷10=
1
25
25%:
1
8
=2
2-
5
12
-
7
12
=1
1
6
+
3
4
+
5
6
+
1
4
=2
3
5
×
1
16
+
3
5
×
15
16
=
3
5
点评:考查了分数、百分数的四则混合运算及求比值.
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