题目内容
| 脱式计算(能简便的要简便) (3.6×
|
5
| ||||||||||||||
5.32×75%+
|
16
| ||||||||||||||
28×[1÷(
|
|
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)先算乘法,再算加法,最后算除法;
(2)先算小括号里面的减法,再算除法,最后算括号外面的减法;
(3)根据乘法分配律进行简算;
(4)根据加法交换律和结合律以及减法的性质进行简算;
(5)先算减法,再算中括号里面的除法,再算乘法,最后算括号外面的除法;
(6)先算减法,再算除法,再算加法,最后算乘法.
(2)先算小括号里面的减法,再算除法,最后算括号外面的减法;
(3)根据乘法分配律进行简算;
(4)根据加法交换律和结合律以及减法的性质进行简算;
(5)先算减法,再算中括号里面的除法,再算乘法,最后算括号外面的除法;
(6)先算减法,再算除法,再算加法,最后算乘法.
解答:
解:(1)(3.6×
+2.4×
)÷
=(3+0.3)÷
=3.3÷
=3.6;
(2)5
-(
-
)÷
=5
-
÷
=5
-1
=4
;
(3)5.32×75%+
+1
÷1
=5.32×
+
+1.68×
=(5.32+1+1.68)×
=8×
=6;
(4)16
-3.67+5
-5.33
=(16
+5
)-(3.67+5.33)
=22-9
=13;
(5)28×[1÷(
-3.09)]÷1.4
=28×[1÷0.01]÷1.4
=28×100÷1.4
=2800÷1.4
=2000;
(6)
×[
+(
-
)÷
]
=
×[
+
÷
]
=
×[
+
]
=
×
=
.
| 5 |
| 6 |
| 1 |
| 8 |
| 11 |
| 12 |
=(3+0.3)÷
| 11 |
| 12 |
=3.3÷
| 11 |
| 12 |
=3.6;
(2)5
| 3 |
| 4 |
| 4 |
| 3 |
| 3 |
| 4 |
| 7 |
| 12 |
=5
| 3 |
| 4 |
| 7 |
| 12 |
| 7 |
| 12 |
=5
| 3 |
| 4 |
=4
| 3 |
| 4 |
(3)5.32×75%+
| 3 |
| 4 |
| 17 |
| 25 |
| 1 |
| 3 |
=5.32×
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 4 |
=(5.32+1+1.68)×
| 3 |
| 4 |
=8×
| 3 |
| 4 |
=6;
(4)16
| 5 |
| 9 |
| 4 |
| 9 |
=(16
| 5 |
| 9 |
| 4 |
| 9 |
=22-9
=13;
(5)28×[1÷(
| 31 |
| 10 |
=28×[1÷0.01]÷1.4
=28×100÷1.4
=2800÷1.4
=2000;
(6)
| 8 |
| 9 |
| 15 |
| 16 |
| 7 |
| 16 |
| 1 |
| 4 |
| 1 |
| 2 |
=
| 8 |
| 9 |
| 15 |
| 16 |
| 3 |
| 16 |
| 1 |
| 2 |
=
| 8 |
| 9 |
| 15 |
| 16 |
| 3 |
| 8 |
=
| 8 |
| 9 |
| 21 |
| 16 |
=
| 7 |
| 6 |
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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