题目内容
|
| ||||||||||||||||
2-
|
(0.75-
|
分析:(1)先算除法,再算乘法,最后算加法;
(2)根据乘法分配律进行简算;
(3)先算除法,再根据连减的性质进行简算;
(4)先算小括号里面的加法和加法,再算乘法.
(2)根据乘法分配律进行简算;
(3)先算除法,再根据连减的性质进行简算;
(4)先算小括号里面的加法和加法,再算乘法.
解答:解:(1)
+
÷
×
,
=
+
×
×
,
=
+
,
=
;
(2)
×
+
÷
,
=
×
+
×
,
=
×(
+
),
=
×1,
=
;
(3)2-
÷
-
,
=2-
-
,
=2-(
+
),
=2-1,
=1;
(4)(0.75-
)×(
+0.3)
=0.25×0.5,
=0.125.
| 5 |
| 9 |
| 1 |
| 8 |
| 3 |
| 4 |
| 2 |
| 3 |
=
| 5 |
| 9 |
| 1 |
| 8 |
| 4 |
| 3 |
| 2 |
| 3 |
=
| 5 |
| 9 |
| 1 |
| 9 |
=
| 2 |
| 3 |
(2)
| 4 |
| 9 |
| 2 |
| 7 |
| 2 |
| 7 |
| 9 |
| 5 |
=
| 4 |
| 9 |
| 2 |
| 7 |
| 2 |
| 7 |
| 5 |
| 9 |
=
| 2 |
| 7 |
| 4 |
| 9 |
| 5 |
| 9 |
=
| 2 |
| 7 |
=
| 2 |
| 7 |
(3)2-
| 3 |
| 11 |
| 9 |
| 22 |
| 1 |
| 3 |
=2-
| 2 |
| 3 |
| 1 |
| 3 |
=2-(
| 2 |
| 3 |
| 1 |
| 3 |
=2-1,
=1;
(4)(0.75-
| 1 |
| 2 |
| 1 |
| 5 |
=0.25×0.5,
=0.125.
点评:四则运算,先弄清运算顺序,然后再进一步计算即可,能简算的要简算.
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