题目内容
脱式计算,能简算的用简便方法计算.
7-
×
-
24÷(1-60%)÷
×
-
÷5
÷[
-(
+
)].
7-
1 |
6 |
3 |
4 |
7 |
8 |
24÷(1-60%)÷
5 |
8 |
17 |
12 |
1 |
5 |
5 |
12 |
5 |
8 |
13 |
12 |
1 |
12 |
1 |
4 |
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)先算乘法,再根据减法的性质进行简算;
(2)先算减法,再按照从左向右的顺序进行计算;
(3)根据乘法分配律进行简算;
(4)中括号里面根据减法的性质进行简算,最后算除法.
(2)先算减法,再按照从左向右的顺序进行计算;
(3)根据乘法分配律进行简算;
(4)中括号里面根据减法的性质进行简算,最后算除法.
解答:
解:(1)7-
×
-
=7-
-
=7-(
+
)
=7-1
=6;
(2)24÷(1-60%)÷
=24÷0.4÷
=60÷
=96;
(3)
×
-
÷5
=
×
-
×
=(
-
)×
=1×
=
;
(4)
÷[
-(
+
)]
=
÷[
-
-
]
=
÷[1-
]
=
÷
=
.
1 |
6 |
3 |
4 |
7 |
8 |
=7-
1 |
8 |
7 |
8 |
=7-(
1 |
8 |
7 |
8 |
=7-1
=6;
(2)24÷(1-60%)÷
5 |
8 |
=24÷0.4÷
5 |
8 |
=60÷
5 |
8 |
=96;
(3)
17 |
12 |
1 |
5 |
5 |
12 |
=
17 |
12 |
1 |
5 |
5 |
12 |
1 |
5 |
=(
17 |
12 |
5 |
12 |
1 |
5 |
=1×
1 |
5 |
=
1 |
5 |
(4)
5 |
8 |
13 |
12 |
1 |
12 |
1 |
4 |
=
5 |
8 |
13 |
12 |
1 |
12 |
1 |
4 |
=
5 |
8 |
1 |
4 |
=
5 |
8 |
3 |
4 |
=
5 |
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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