题目内容
计算题.
| 160.6×2
| 5.4×[1÷(
| ||||||||||||||||||||
| 2100÷[56×(
| [
| ||||||||||||||||||||
2.42÷
| 0.75×
| |||||||||||||||||||||
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,方程的解和解方程
专题:运算顺序及法则,运算定律及简算,简易方程
分析:(1)先算小括号里面的减法,再算中括号里面的乘法,最后算除法.
(2)、(4)、(7)将其中的除法改写成乘法,然后用乘法分配律简算.
(3)先算小括号里面的减法,再算中括号里面的除法,最后算乘法.
(6)先算小括号里面的减法,再算中括号里面的减法,最后算除法.
(5)中括号里面用乘法分配律去掉小括号.
(8)用乘法分配律进行简算.
(2)、(4)、(7)将其中的除法改写成乘法,然后用乘法分配律简算.
(3)先算小括号里面的减法,再算中括号里面的除法,最后算乘法.
(6)先算小括号里面的减法,再算中括号里面的减法,最后算除法.
(5)中括号里面用乘法分配律去掉小括号.
(8)用乘法分配律进行简算.
解答:
解:(1)
÷[3.75×(1.2-
)]
=
÷[3.75×1]
=
÷3.75
=
÷
=0.2
(2)160.6×2
-0.6÷
=160.6×2
-0.6×2
=(160.6-0.6)×2
=160×2
=440
(3)5.4×[1÷(
-
)]
=5.4×[1÷0.1]
=5.4×10
=54
(4)
÷
+
×
=
×
+
×
=(
+
)×
=
(5)2100÷[56×(
-
)]
=2100÷[56×
-56×
]
=2100÷[24-21]
=2100÷3
=700
(6)[
-(
-
)]÷
=[
-
]÷
=
÷
=
(7)2.42÷
+4.58×
+3÷4
=2.42×
+4.58×
+
=(2.42+4.58+1)×
=8×
=6
(8)0.75×
+
×0.75
=0.75×(
+
)
=0.75×1
=0.75
3 |
4 |
1 |
5 |
=
3 |
4 |
=
3 |
4 |
=
3 |
4 |
15 |
4 |
=0.2
(2)160.6×2
3 |
4 |
4 |
11 |
=160.6×2
3 |
4 |
3 |
4 |
=(160.6-0.6)×2
3 |
4 |
=160×2
3 |
4 |
=440
(3)5.4×[1÷(
9 |
10 |
4 |
5 |
=5.4×[1÷0.1]
=5.4×10
=54
(4)
5 |
7 |
13 |
5 |
2 |
7 |
5 |
13 |
=
5 |
7 |
5 |
13 |
2 |
7 |
5 |
13 |
=(
5 |
7 |
2 |
7 |
5 |
13 |
=
5 |
13 |
(5)2100÷[56×(
3 |
7 |
3 |
8 |
=2100÷[56×
3 |
7 |
3 |
8 |
=2100÷[24-21]
=2100÷3
=700
(6)[
1 |
2 |
2 |
3 |
2 |
5 |
7 |
10 |
=[
1 |
2 |
4 |
15 |
7 |
10 |
=
7 |
30 |
7 |
10 |
=
1 |
3 |
(7)2.42÷
4 |
3 |
3 |
4 |
=2.42×
3 |
4 |
3 |
4 |
3 |
4 |
=(2.42+4.58+1)×
3 |
4 |
=8×
3 |
4 |
=6
(8)0.75×
5 |
7 |
2 |
7 |
=0.75×(
5 |
7 |
2 |
7 |
=0.75×1
=0.75
点评:本题考查整数、分数、小数的四则混合运算.须按照四则混合运算的法则进行计算.有简便算法的要用简便算法.
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