题目内容
计算下面各题.
×14
×
×(
-
)
-
×
54×
×
×
×
.
7 |
8 |
21 |
45 |
5 |
7 |
8 |
33 |
5 |
8 |
1 |
6 |
5 |
8 |
5 |
6 |
2 |
15 |
54×
2 |
3 |
7 |
9 |
7 |
10 |
5 |
42 |
8 |
15 |
分析:(1)(2)(5)(6)直接约分计算即可;
(3)先算减法,再算乘法;
(4)先算乘法,再算减法.
(3)先算减法,再算乘法;
(4)先算乘法,再算减法.
解答:解:(1)
×14=
;
(2)
×
=
;
(3)
×(
-
)
=
×
=
;
(4)
-
×
=
-
=
;
(5)54×
×
=36×
=28;
(6)
×
×
=
×
=
.
7 |
8 |
49 |
4 |
(2)
21 |
45 |
5 |
7 |
1 |
3 |
(3)
8 |
33 |
5 |
8 |
1 |
6 |
=
8 |
33 |
11 |
24 |
=
1 |
9 |
(4)
5 |
8 |
5 |
6 |
2 |
15 |
=
5 |
8 |
1 |
9 |
=
37 |
72 |
(5)54×
2 |
3 |
7 |
9 |
=36×
7 |
9 |
=28;
(6)
7 |
10 |
5 |
42 |
8 |
15 |
=
1 |
12 |
8 |
15 |
=
2 |
45 |
点评:此题考查分数的连乘以及分数乘减混合运算的计算方法,计算乘法注意约分,乘减注意运算顺序.

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