题目内容
用递等式计算. 5304-5304÷221+220 | 19.5×0.2-2.07÷23 | (
| ||||||||||||||||||||
4.8×
| 3
| [2-(1
|
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)先算除法,再算减法,最后算加法;
(2)先算乘法和除法,再算减法;
(3)根据乘法分配律进行简算;
(4)根据乘法分配律进行简算;
(5)根据乘法分配律进行简算;
(6)先算小括号里面的减法,再算除法,再算中括号里面的减法,最后算乘法.
(2)先算乘法和除法,再算减法;
(3)根据乘法分配律进行简算;
(4)根据乘法分配律进行简算;
(5)根据乘法分配律进行简算;
(6)先算小括号里面的减法,再算除法,再算中括号里面的减法,最后算乘法.
解答:
解:(1)5304-5304÷221+220
=5304-24+220
=5280+220
=5500;
(2)19.5×0.2-2.07÷23
=3.9-0.09
=3.81;
(3)(
+1
-1
)×63
=
×63+1
×63-1
×63
=56+105-81
=161-81
=80;
(4)4.8×
+7.2÷2
=4.8×
+7.2×
=(4.8+7.2)×
=12×
=5;
(5)3
+3
×2
-2
÷1
=3
×(1+2
)-2
×
=3
×3
-2
×
=12
-2
=10
;
(6)[2-(1
-1.5)÷1
]×6
=[2-
÷1
]×6
=[2-
]×6
=1
×6
=12.
=5304-24+220
=5280+220
=5500;
(2)19.5×0.2-2.07÷23
=3.9-0.09
=3.81;
(3)(
8 |
9 |
2 |
3 |
2 |
7 |
=
8 |
9 |
2 |
3 |
2 |
7 |
=56+105-81
=161-81
=80;
(4)4.8×
5 |
12 |
2 |
5 |
=4.8×
5 |
12 |
5 |
12 |
=(4.8+7.2)×
5 |
12 |
=12×
5 |
12 |
=5;
(5)3
3 |
4 |
3 |
4 |
2 |
5 |
2 |
5 |
1 |
5 |
=3
3 |
4 |
2 |
5 |
2 |
5 |
5 |
6 |
=3
3 |
4 |
2 |
5 |
2 |
5 |
5 |
6 |
=12
3 |
4 |
=10
3 |
4 |
(6)[2-(1
2 |
3 |
5 |
12 |
3 |
8 |
=[2-
1 |
6 |
5 |
12 |
3 |
8 |
=[2-
2 |
17 |
3 |
8 |
=1
15 |
17 |
3 |
8 |
=12.
点评:考查了运算定律与简便运算,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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