题目内容
口算下面各题.
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2÷
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6.4÷0.08= | 4-2.92= |
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分析:(1)(2)(3)(9)通分计算;(4)(6)(10)(11)(14)(15)(18)把除法改为乘法,再计算;(5)(7)(8)(12)(13)属于分数乘法,该约分的要约分;(16)把被除数和除数分别扩大100倍,再相除;(17)注意数位对齐.
解答:解:
-
=
;
+
=
;
-
=
; 2÷
=8;
×6=
;
÷
=
;
×6=2;
×
=
;
-
=
;
÷
=
;
÷
=
;
×
=
;
×
=
;
÷
=
;
÷
=
; 6.4÷0.08=80; 4-2.92=1.08;
÷
=
.
1 |
3 |
1 |
5 |
2 |
15 |
1 |
4 |
3 |
5 |
17 |
20 |
7 |
8 |
1 |
2 |
3 |
8 |
1 |
4 |
7 |
10 |
21 |
5 |
8 |
9 |
8 |
10 |
10 |
9 |
1 |
3 |
3 |
8 |
1 |
4 |
3 |
32 |
2 |
3 |
1 |
4 |
5 |
12 |
1 |
6 |
1 |
3 |
1 |
2 |
1 |
2 |
3 |
4 |
2 |
3 |
8 |
19 |
5 |
16 |
5 |
38 |
1 |
4 |
4 |
10 |
1 |
10 |
7 |
12 |
7 |
4 |
1 |
3 |
5 |
7 |
10 |
21 |
3 |
2 |
7 |
9 |
6 |
7 |
49 |
54 |
点评:此题考查了分数的乘法和除法,以及小数的除法和减法,根据题目特点,灵活解答.
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