题目内容
细心算一算.
(
-
+
)+
+[
-(
+
)]
35
-(11
+20
)-2
(3
×60-60÷
)×(
+
-
)
(
| 4 |
| 5 |
| 1 |
| 6 |
| 5 |
| 12 |
| 1 |
| 60 |
| 4 |
| 25 |
| 7 |
| 6 |
| 1 |
| 6 |
| 3 |
| 5 |
35
| 7 |
| 8 |
| 3 |
| 4 |
| 7 |
| 8 |
| 1 |
| 4 |
| 7 |
| 8 |
| 8 |
| 23 |
| 1 |
| 2 |
| 1 |
| 5 |
| 5 |
| 12 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)按照先从左到右顺序计算括号里面的,再算括号外面的顺序计算解答,
(2)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解答,
(3)运用减法性质解答,
(4)运用乘法分配律解答.
(2)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解答,
(3)运用减法性质解答,
(4)运用乘法分配律解答.
解答:
解:(1)(
-
+
)+
=(
+
)+
=
+
=1
;
(2)
+[
-(
+
)]
=
+[
-
-
]
=
+
=
;
(3)35
-(11
+20
)-2
=(35
-20
)-(11
+2
)
=15-14
=1;
(4)(3
×60-60÷
)×(
+
-
)
=60×(3
-
)×(
-
)
=60×1×
=17.
| 4 |
| 5 |
| 1 |
| 6 |
| 5 |
| 12 |
| 1 |
| 60 |
=(
| 19 |
| 30 |
| 5 |
| 12 |
| 1 |
| 60 |
=
| 63 |
| 60 |
| 1 |
| 60 |
=1
| 1 |
| 15 |
(2)
| 4 |
| 25 |
| 7 |
| 6 |
| 1 |
| 6 |
| 3 |
| 5 |
=
| 4 |
| 25 |
| 7 |
| 6 |
| 1 |
| 6 |
| 3 |
| 5 |
=
| 4 |
| 25 |
| 2 |
| 5 |
=
| 14 |
| 25 |
(3)35
| 7 |
| 8 |
| 3 |
| 4 |
| 7 |
| 8 |
| 1 |
| 4 |
=(35
| 7 |
| 8 |
| 7 |
| 8 |
| 3 |
| 4 |
| 1 |
| 4 |
=15-14
=1;
(4)(3
| 7 |
| 8 |
| 8 |
| 23 |
| 1 |
| 2 |
| 1 |
| 5 |
| 5 |
| 12 |
=60×(3
| 7 |
| 8 |
| 23 |
| 8 |
| 7 |
| 10 |
| 5 |
| 12 |
=60×1×
| 17 |
| 60 |
=17.
点评:本题主要考查学生依据四则运算计算方法正确进行计算,以及正确运用简便方法解决问题的能力.
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