题目内容
脱式计算:
13
-3
×3-5
÷2
;
×[
-(
-0.25)];
(
+
)÷(1-
×0.4).
13
1 |
2 |
2 |
3 |
5 |
12 |
1 |
6 |
8 |
9 |
3 |
4 |
7 |
16 |
(
1 |
4 |
3 |
8 |
3 |
4 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)先算乘法和除法,再按照从左向右的顺序进行计算;
(2)中括号里面根据减法的性质进行简算,最后算乘法;
(3)先算加法和乘法,再算减法,最后算除法.
(2)中括号里面根据减法的性质进行简算,最后算乘法;
(3)先算加法和乘法,再算减法,最后算除法.
解答:
解:(1)13
-3
×3-5
÷2
=13
-11-2
=2
-2
=0;
(2)
×[
-(
-0.25)]
=
×[
-
+0.25]
=
×[
+0.25-
]
=
×[1-
]
=
×
=
;
(3)(
+
)÷(1-
×0.4)
=
÷(1-0.3)
=
÷0.7
=
.
1 |
2 |
2 |
3 |
5 |
12 |
1 |
6 |
=13
1 |
2 |
1 |
2 |
=2
1 |
2 |
1 |
2 |
=0;
(2)
8 |
9 |
3 |
4 |
7 |
16 |
=
8 |
9 |
3 |
4 |
7 |
16 |
=
8 |
9 |
3 |
4 |
7 |
16 |
=
8 |
9 |
7 |
16 |
=
8 |
9 |
9 |
16 |
=
1 |
2 |
(3)(
1 |
4 |
3 |
8 |
3 |
4 |
=
5 |
8 |
=
5 |
8 |
=
25 |
28 |
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.
练习册系列答案
相关题目