题目内容
递等式计算 1÷(
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分析:(1)(4)先算括号内的,再算括号外的;
(2)先算乘法,再算减法;
(3)把除法改为乘法,运用乘法交换律与结合律简算;
(5)把除法改为乘法,约分计算;
(6)先算除法,再算加法.
(2)先算乘法,再算减法;
(3)把除法改为乘法,运用乘法交换律与结合律简算;
(5)把除法改为乘法,约分计算;
(6)先算除法,再算加法.
解答:解:(1)1÷(
÷
),
=1÷(
×3),
=1÷
,
=
;
(2)
-
×
,
=
-
,
=
;
(3)
×8÷
×8,
=
×8×
×8,
=(
×
)×(8×8),
=
×64,
=
;
(4)
×(
-
),
=
×
,
=
;
(5)
÷
×
,
=
×
×
,
=
;
(6)
+
÷
,
=
+
×
,
=
+
,
=
.
1 |
2 |
1 |
3 |
=1÷(
1 |
2 |
=1÷
3 |
2 |
=
2 |
3 |
(2)
3 |
8 |
3 |
10 |
5 |
6 |
=
3 |
8 |
1 |
4 |
=
1 |
8 |
(3)
3 |
13 |
10 |
13 |
=
3 |
13 |
13 |
10 |
=(
3 |
13 |
13 |
10 |
=
3 |
10 |
=
96 |
5 |
(4)
3 |
10 |
5 |
7 |
10 |
21 |
=
3 |
10 |
5 |
21 |
=
1 |
14 |
(5)
9 |
10 |
7 |
22 |
14 |
33 |
=
9 |
10 |
22 |
7 |
14 |
33 |
=
6 |
5 |
(6)
3 |
8 |
5 |
8 |
15 |
16 |
=
3 |
8 |
5 |
8 |
16 |
15 |
=
3 |
8 |
2 |
3 |
=
25 |
24 |
点评:考查了分数的四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
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