题目内容
计算下面各题,能简算的要简算.
(1)
÷(
-
)×
;
(2)(
-
+
)×12;
(3)
÷
+
×
;
(4) ÷
.
(1)
1 |
3 |
2 |
3 |
2 |
5 |
3 |
5 |
(2)(
1 |
3 |
1 |
6 |
1 |
4 |
(3)
7 |
9 |
11 |
5 |
2 |
9 |
5 |
11 |
(4)
7 |
10 |
考点:分数的四则混合运算,分数的简便计算
专题:运算顺序及法则
分析:(1)按照先算括号里面的减法,再按照从左到右顺序计算即可解答,
(2)(3)运用乘法分配律解答,
(4)按照先算小括号里面的,再算中括号里面的,最后算括号外面的顺序计算即可解答.
(2)(3)运用乘法分配律解答,
(4)按照先算小括号里面的,再算中括号里面的,最后算括号外面的顺序计算即可解答.
解答:
解:(1)
÷(
-
)×
=
÷
×
=
×
=
;
(2)(
-
+
)×12
=
×12-
×12+
×12
=4-2+3
=5;
(3)
÷
+
×
=(
+
)×
=1×
=
;
(4)[
-(
-
)]÷
=[
-
]÷
=
÷
=
.
1 |
3 |
2 |
3 |
2 |
5 |
3 |
5 |
=
1 |
3 |
4 |
15 |
3 |
5 |
=
5 |
4 |
3 |
5 |
=
3 |
4 |
(2)(
1 |
3 |
1 |
6 |
1 |
4 |
=
1 |
3 |
1 |
6 |
1 |
4 |
=4-2+3
=5;
(3)
7 |
9 |
11 |
5 |
2 |
9 |
5 |
11 |
=(
7 |
9 |
2 |
9 |
5 |
11 |
=1×
5 |
11 |
=
5 |
11 |
(4)[
1 |
2 |
3 |
4 |
3 |
5 |
7 |
10 |
=[
1 |
2 |
3 |
20 |
7 |
10 |
=
7 |
20 |
7 |
10 |
=
1 |
2 |
点评:本题主要考查学生四则运算计算方法,以及正确运用简便方法解决问题的能力.
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