题目内容

口算
5
6
×
9
10
=
24
19
÷8=
0.375×
4
9
=
4.2+
3
5
=
24÷
3
8
=
3×3×3= 63×10%= 1.5×0.4= 3.14×6= 0.18÷3=
分析：根据分数乘除法的计算法则和小数乘除法的计算法则求解．
解答：解：
5
6
×
9
10
=
3
4
，
24
19
÷8=
3
19
，
0.375×
4
9
=
1
6
，
4.2+
3
5
=4.8，
24÷
3
8
=64，
3×3×3=27， 63×10%=6.3， 1.5×0.4=0.6， 3.14×6=18.84， 0.18÷3=0.06．
点评：分数的计算要注意把结果化成最简分数；小数的计算要注意小数点的位置．
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口算．
56+47= 12.6÷3= 0.36÷0.9= 910+70=
0.25×0.4=
1
5
×
1
8
=		 16×5= 1÷0.25=
1
2
+
1
3
=		 12+0.8=
口算．
1
3
+
1
4
=
1
5
+
1
6
=
9
10
+
1
10
=
1
14
+
1
14
2
7
+
2
7
=
5
6
-
1
6
=
13
14
-
3
14
=
9
9
-
5
5
=
口算比赛，小明做对了
9
10
，正好54题．小军做对总数的
5
6
，小军做对多少题？
口算
1
4
×
1
3
=
4
7
÷2=
1
2
÷
1
2
=		 10÷
5
6
=
2
3
×
3
4
=
9
10
÷
1
5
=
1
6
÷6=
8
9
÷4=		 15×
4
5
=		 15÷
1
3
=
3
4
×
2
9
=
2
3
÷
1
2
=
2
5
×
1
2
=
1
2
÷
1
4
=
1
2
×
1
4
=
4
5
÷
1
5
=
3
7
×14=
1
4
÷
1
2
=
1
2
-
1
4
=
4
9
×
3
4
=
5
8
×
2
5
=
1
6
÷
2
3
=
1
2
+
1
4
=
3
5
÷1=
7
15
×5=		 1÷
3
4
=
1
2
÷
1
4
=		 1÷
3
5
=
3
4
×12=
1
5
÷
2
3
=
7
9
×
3
7
=		 1-
3
5
=		 18×
5
6
=		 7÷
7
5
=
1
3
+
1
6
=		 1+
3
5
=
2
9
×
1
4
=
8
3
÷2=
3
5
÷
2
5
=
5
9
÷3=
5
6
×
3
10
=
2
5
÷
1
2
=
8×
1
4
=		 9÷
3
4
=		 30×
1
3
=
4
5
÷2=
5
24
÷
5
6
=
5
8
×
1
2
×0=
1
3
×
3
11
=		 8÷
1
4
=
9
10
÷
3
5
=		 0÷
1
3
÷
1
2
=		 1×
9
11
=
2
5
÷
1
5
=
1
3
÷
1
3
=		 0×
2
9
÷
1
2
=
5
6
×
6
5
=
1
5
÷
1
3
=		 0÷
5
12
=		 1×
1
2
÷
1
2
=

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