题目内容
脱式计算.
3-2÷3-
| 3.6×
| (
| ||||||||||||
8.5-(5.6+4.8)÷1.3 | 375+450÷18×25 | (
|
考点:整数、分数、小数、百分数四则混合运算,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)先算除法,再根据减法的性质进行简算;
(2)根据乘法分配律进行简算;
(3)根据乘法分配律进行简算;
(4)先算加法,再算除法,最后算减法;
(5)先算除法,再算乘法,最后算加法;
(6)先算小括号里面的加法,再算除法,最后算括号外面的加法.
(2)根据乘法分配律进行简算;
(3)根据乘法分配律进行简算;
(4)先算加法,再算除法,最后算减法;
(5)先算除法,再算乘法,最后算加法;
(6)先算小括号里面的加法,再算除法,最后算括号外面的加法.
解答:
解:(1)3-2÷3-
=3-
-
=3-(
+
)
=3-1
=2;
(2)3.6×
+0.4÷
=3.6×
+0.4×
=(3.6+0.4)×
=4×
=
;
(3)(
+
-
)×24
=
×24+
×24-
×24
=12+18-4
=30-4
=26;
(4)8.5-(5.6+4.8)÷1.3
=8.5-10.4÷1.3
=8.5-8
=0.5;
(5)375+450÷18×25
=375+25×25
=375+625
=1000;
(6)(
+
)÷
+
=
÷
+
=
+
=
.
1 |
3 |
=3-
2 |
3 |
1 |
3 |
=3-(
2 |
3 |
1 |
3 |
=3-1
=2;
(2)3.6×
5 |
8 |
8 |
5 |
=3.6×
5 |
8 |
5 |
8 |
=(3.6+0.4)×
5 |
8 |
=4×
5 |
8 |
=
5 |
2 |
(3)(
1 |
2 |
3 |
4 |
1 |
6 |
=
1 |
2 |
3 |
4 |
1 |
6 |
=12+18-4
=30-4
=26;
(4)8.5-(5.6+4.8)÷1.3
=8.5-10.4÷1.3
=8.5-8
=0.5;
(5)375+450÷18×25
=375+25×25
=375+625
=1000;
(6)(
4 |
5 |
1 |
4 |
7 |
3 |
7 |
10 |
=
21 |
20 |
7 |
3 |
7 |
10 |
=
9 |
20 |
7 |
10 |
=
23 |
20 |
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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