题目内容
计算下面各题,能简算的要简算.
24×
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|
|
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36÷(
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|
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|
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考点:分数的四则混合运算,运算定律与简便运算
专题:运算顺序及法则,运算定律及简算
分析:(1)(2)根据分数乘法的运算法则约分计算即可.
(3)先算除法,再算乘法.
(4)先算括号中的除法,再算乘法.
(5)先算括号中的除法,再算括号外的除法.
(6)可根据乘法交换律计算.
(7)可根据乘法交换律与结合律计算.
(8)(10)可根据乘法分配律计算.
(9)先算除法,再算减法.
(11)可根据乘法结合律计算.
(12)可根据乘法交换律计算.
(3)先算除法,再算乘法.
(4)先算括号中的除法,再算乘法.
(5)先算括号中的除法,再算括号外的除法.
(6)可根据乘法交换律计算.
(7)可根据乘法交换律与结合律计算.
(8)(10)可根据乘法分配律计算.
(9)先算除法,再算减法.
(11)可根据乘法结合律计算.
(12)可根据乘法交换律计算.
解答:
解:(1)24×
×
=5;
(2)
×
×
=
;
(3)
÷
×
=
×
=
;
(4)
×(
÷
)
=
×
=
;
(5)36÷(
÷
)
=36÷
=
;
(6)
×
×
=
×
×
=
×
=
;
(7)
×
×
×
=
×
×(
×
)
=
×
=
;
(8)
×(
-
)
=
×
-
×
=
-
=
;
(9)
÷3-
=
-
=
;
(10)
×
-
×
=(
-
)×
=1×
=
;
(11)
×(
×
)
=
×
×
=1×
=
;
(12)
×
÷
×
=
÷
×
×
=1×
×
=
.
5 |
6 |
1 |
4 |
(2)
4 |
7 |
3 |
8 |
2 |
9 |
1 |
21 |
(3)
3 |
10 |
3 |
11 |
5 |
22 |
=
11 |
10 |
5 |
22 |
=
1 |
4 |
(4)
6 |
25 |
5 |
7 |
2 |
7 |
=
6 |
25 |
5 |
2 |
=
3 |
5 |
(5)36÷(
5 |
8 |
10 |
7 |
=36÷
7 |
16 |
=
576 |
7 |
(6)
3 |
4 |
5 |
11 |
1 |
3 |
=
3 |
4 |
1 |
3 |
5 |
11 |
=
1 |
4 |
5 |
11 |
=
5 |
44 |
(7)
11 |
7 |
6 |
7 |
2 |
11 |
2 |
3 |
=
11 |
7 |
2 |
11 |
6 |
7 |
2 |
3 |
=
2 |
7 |
4 |
7 |
=
8 |
49 |
(8)
7 |
8 |
8 |
9 |
3 |
7 |
=
7 |
8 |
8 |
9 |
7 |
8 |
3 |
7 |
=
7 |
9 |
3 |
8 |
=
29 |
72 |
(9)
5 |
7 |
2 |
21 |
=
5 |
21 |
2 |
21 |
=
1 |
7 |
(10)
9 |
16 |
11 |
8 |
9 |
16 |
3 |
8 |
=(
11 |
8 |
3 |
8 |
9 |
16 |
=1×
9 |
16 |
=
9 |
16 |
(11)
5 |
6 |
6 |
5 |
1 |
2 |
=
5 |
6 |
6 |
5 |
1 |
2 |
=1×
1 |
2 |
=
1 |
2 |
(12)
7 |
9 |
2 |
7 |
7 |
9 |
2 |
7 |
=
7 |
9 |
7 |
9 |
2 |
7 |
2 |
7 |
=1×
2 |
7 |
2 |
7 |
=
4 |
49 |
点评:完成本题要注意分析式中数据的特点,然后运用合适的方法计算.
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