题目内容
用递等式计算. (1)27×
|
(2)
| ||||||||||
(3)1-
|
(4)(
|
分析:(1)先算乘法,再算加法;
(2)先算加法,再算乘法;
(3)先算乘法,再算减法;
(4)先算减法,再算乘法.
(2)先算加法,再算乘法;
(3)先算乘法,再算减法;
(4)先算减法,再算乘法.
解答:解:
(1)27×
+3,
=21+3,
=24;
(2)
×(
+
),
=
×
,
=
;
(3)1-
×
,
=1-
,
=
;
(4)(
-
)×
,
=
×
,
=
.
(1)27×
7 |
9 |
=21+3,
=24;
(2)
3 |
14 |
1 |
2 |
2 |
3 |
=
3 |
14 |
7 |
6 |
=
1 |
4 |
(3)1-
8 |
15 |
9 |
16 |
=1-
3 |
10 |
=
7 |
10 |
(4)(
5 |
4 |
1 |
8 |
2 |
3 |
=
9 |
8 |
2 |
3 |
=
3 |
4 |
点评:考查了分数四则混合运算.注意运算顺序和运算法则,然后再进一步计算.
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