题目内容
计算下列各题,能简算的要简算.
(1-
)÷
×
30×(
+
+
)
×
+
÷4
+(
+
)×
.
(1-
14 |
15 |
4 |
9 |
5 |
18 |
30×(
1 |
15 |
4 |
5 |
1 |
3 |
1 |
4 |
3 |
5 |
4 |
5 |
2 |
3 |
4 |
7 |
1 |
2 |
7 |
25 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)先算减法,再算除法,最后算乘法;
(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)先算小括号里面的加法,再算乘法,最后算可能外面的加法.
(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)先算小括号里面的加法,再算乘法,最后算可能外面的加法.
解答:
解:(1)(1-
)÷
×
=
÷
×
=
×
=
;
(2)30×(
+
+
)
=30×
+30×
+30×
=2+24+10
=26+10
=36;
(3)
×
+
÷4
=
×
+
×
=
×(
+
)
=
×
=
;
(4)
+(
+
)×
=
+
×
=
+
=
.
14 |
15 |
4 |
9 |
5 |
18 |
=
1 |
15 |
4 |
9 |
5 |
18 |
=
3 |
20 |
5 |
18 |
=
1 |
24 |
(2)30×(
1 |
15 |
4 |
5 |
1 |
3 |
=30×
1 |
15 |
4 |
5 |
1 |
3 |
=2+24+10
=26+10
=36;
(3)
1 |
4 |
3 |
5 |
4 |
5 |
=
1 |
4 |
3 |
5 |
4 |
5 |
1 |
4 |
=
1 |
4 |
3 |
5 |
4 |
5 |
=
1 |
4 |
7 |
5 |
=
7 |
20 |
(4)
2 |
3 |
4 |
7 |
1 |
2 |
7 |
25 |
=
2 |
3 |
15 |
14 |
7 |
25 |
=
2 |
3 |
3 |
10 |
=
29 |
30 |
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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