题目内容
(2012?济南)下面各题,怎样简算就怎样算.
(1)0.25-
+
-
(2)6-
÷
-
(3)
+
÷
×
(4)(
-
+
)÷
.
(1)0.25-
| 11 |
| 15 |
| 3 |
| 4 |
| 4 |
| 15 |
(2)6-
| 5 |
| 12 |
| 10 |
| 9 |
| 13 |
| 8 |
(3)
| 1 |
| 5 |
| 4 |
| 5 |
| 16 |
| 75 |
| 8 |
| 25 |
(4)(
| 5 |
| 7 |
| 1 |
| 14 |
| 5 |
| 6 |
| 5 |
| 42 |
分析:(1)将算式中的0.25改写成分数,然后再交换-
和+
的位置,然后再进行计算即可;
(2)先计算算式中的除法,然后再用6减去两个减数的和即可得到答案;
(3)根据分数的四则混合运算进行计算即可得到答案;
(4)将算式中除以
改写成乘
,然后再利用乘法分配律进行计算即可得到答案.
| 11 |
| 15 |
| 3 |
| 4 |
(2)先计算算式中的除法,然后再用6减去两个减数的和即可得到答案;
(3)根据分数的四则混合运算进行计算即可得到答案;
(4)将算式中除以
| 5 |
| 42 |
| 42 |
| 5 |
解答:解:(1)0.25-
+
-
=
+
-(
+
),
=1-1,
=0;
(2)6-
÷
-
=6-
-
,
=6-(
+
),
=6-2,
=4;
(3)
+
÷
×
=
+
÷
×
,
=
+
×
,
=
+
,
=1
;
(4)(
-
+
)÷
=(
-
+
)×
,
=
×
-
×
+
×
,
=6-
+7
=12
.
| 11 |
| 15 |
| 3 |
| 4 |
| 4 |
| 15 |
=
| 1 |
| 4 |
| 3 |
| 4 |
| 11 |
| 15 |
| 4 |
| 15 |
=1-1,
=0;
(2)6-
| 5 |
| 12 |
| 10 |
| 9 |
| 13 |
| 8 |
=6-
| 3 |
| 8 |
| 13 |
| 8 |
=6-(
| 3 |
| 8 |
| 13 |
| 8 |
=6-2,
=4;
(3)
| 1 |
| 5 |
| 4 |
| 5 |
| 16 |
| 75 |
| 8 |
| 25 |
=
| 1 |
| 5 |
| 4 |
| 5 |
| 16 |
| 75 |
| 8 |
| 25 |
=
| 1 |
| 5 |
| 15 |
| 4 |
| 8 |
| 25 |
=
| 1 |
| 5 |
| 6 |
| 5 |
=1
| 2 |
| 5 |
(4)(
| 5 |
| 7 |
| 1 |
| 14 |
| 5 |
| 6 |
| 5 |
| 42 |
=(
| 5 |
| 7 |
| 1 |
| 14 |
| 5 |
| 6 |
| 42 |
| 5 |
=
| 5 |
| 7 |
| 42 |
| 5 |
| 1 |
| 14 |
| 42 |
| 5 |
| 5 |
| 6 |
| 42 |
| 5 |
=6-
| 3 |
| 5 |
=12
| 2 |
| 5 |
点评:此题主要考查的是分数的四则混合运算及简便运算的应用.
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