题目内容

直接写出得数．
1
5
×
3
4
=
7
12
×24=
8
17
×51=
4
9
×
4
9
=
7
15
×
14
15
=
21
25
×7=
0.5×
5
24
=		1.6×
1
4
=
1
5
×
3
4
=
3
20
7
12
×24=14
8
17
×51=24
4
9
×
4
9
=
16
81
7
15
×
14
15
=
98
225
21
25
×7=
147
25
0.5×
5
24
=
5
48
1.6×
1
4
=0.4．
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5
×10=
6
7
÷
2
7
=
4
5
÷80%=
8×12．%=
4
21
×0×
10
11
=
3
5
-
3
7
=
0.5+
1
4
=
5
8
×
8
7
=
9
10
÷3=
（
3
5
-
3
7
）×
1
2
=
计算
4
5
÷
2
15
2
3
×
9
10
3
8
÷
5
8
4
7
×
7
8
4
5
÷
1
2
1÷
2
3
1
3
×
2
5
16÷
4
5
5
9
÷
5
18
1
2
+
1
3
5
12
÷
1
8
1
3
÷
1
2
．
3
4
×16=
4
13
×
3
8
=
1
7
-
1
8
=
2
9
×
1
6
=
6÷
1
4
=
4
9
÷
2
3
=
2
15
÷4=
5
7
÷
7
5
=
1
5
+
1
4
=
1
2
-
1
3
=		100×
8
15
=		8×
1
4
=
1÷
2
3
=
14
15
-
4
5
=		12÷
5
8
=		0×
1
15
=
直接写出得数．
3
5
×
5
6
=		2+0.8=
2
5
-
2
7
=		（
3
5
-
1
3
）×30=
1
5
+
1
7
=
1
10
÷5=
3
8
÷
3
10
=		4×
1
4
÷4×
1
4
=
计算
2
3
×60=
15
4
×
2
5
=
3
8
×
3
8
=
3
5
×
5
27
×
3
8
=
5
9
÷5=		30÷
5
6
=
8
15
÷
2
3
=
2
3
×
5
4
÷
10
9
=
a为自然数，下列算式中，（　　）得数最大 （a≠0）
A．
2
3
×a		B．
2
3
÷a		C．a÷
2
3
10米增加它的
1
5
后，是（　　）
A．10
1
5
米		B．9
4
5
C．12米D．8米
4
5
×______=
1
4
÷______=1．

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