题目内容
怎样简便就怎样算.
×8÷
+
×
÷
÷
(
+
)×
(
-
)×
1-
÷
.
| 1 |
| 5 |
| 4 |
| 5 |
| 3 |
| 5 |
| 1 |
| 2 |
| 4 |
| 5 |
| 5 |
| 6 |
| 2 |
| 3 |
| 5 |
| 6 |
(
| 5 |
| 8 |
| 6 |
| 5 |
| 4 |
| 25 |
(
| 5 |
| 6 |
| 2 |
| 3 |
| 9 |
| 10 |
1-
| 7 |
| 9 |
| 7 |
| 8 |
分析:(1)从左往右依次运算;
(2)先算乘法,再算加法;
(3)把除法改为乘法,约分计算;
(4)(5)先算括号内的,再算括号外的;
(6)先算除法,再算减法.
(2)先算乘法,再算加法;
(3)把除法改为乘法,约分计算;
(4)(5)先算括号内的,再算括号外的;
(6)先算除法,再算减法.
解答:解:(1)
×8÷
=
×
=2;
(2)
+
×
=
+
=1;
(3)
÷
÷
=
÷
÷
=1×
=
;
(4)(
+
)×
=
×
=
;
(5)(
-
)×
=
×
=
;
(6)1-
÷
=1-
×
=1-
=
.
| 1 |
| 5 |
| 4 |
| 5 |
=
| 8 |
| 5 |
| 5 |
| 4 |
=2;
(2)
| 3 |
| 5 |
| 1 |
| 2 |
| 4 |
| 5 |
=
| 3 |
| 5 |
| 2 |
| 5 |
=1;
(3)
| 5 |
| 6 |
| 2 |
| 3 |
| 5 |
| 6 |
=
| 5 |
| 6 |
| 5 |
| 6 |
| 2 |
| 3 |
=1×
| 3 |
| 2 |
=
| 3 |
| 2 |
(4)(
| 5 |
| 8 |
| 6 |
| 5 |
| 4 |
| 25 |
=
| 73 |
| 40 |
| 4 |
| 25 |
=
| 73 |
| 250 |
(5)(
| 5 |
| 6 |
| 2 |
| 3 |
| 9 |
| 10 |
=
| 1 |
| 6 |
| 9 |
| 10 |
=
| 3 |
| 20 |
(6)1-
| 7 |
| 9 |
| 7 |
| 8 |
=1-
| 7 |
| 9 |
| 8 |
| 7 |
=1-
| 8 |
| 9 |
=
| 1 |
| 9 |
点评:此题考查了分数的四则混合运算,注意运算顺序和运算法则.
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