题目内容
| 计算,能简算的要简算. (
|
3-
| ||||||||||||
(0.25-
|
|
分析:(1)根据乘法分配律进行简算;
(2)先算除法,再算根据减法的性质进行简算;
(3)先算小括号里面的减法,再算除法;
(4)先算除法,再算加法.
(2)先算除法,再算根据减法的性质进行简算;
(3)先算小括号里面的减法,再算除法;
(4)先算除法,再算加法.
解答:解:(1)(
+
-
)×36
=
×36+
×36-
×36
=4+12-6
=16-6
=10;
(2)3-
÷
-
=3-
-
=3-(
+
)
=3-1
=2;
(3)(0.25-
)÷(
-
)
=
÷
=
;
(4)
÷
+
=
+
=
.
| 1 |
| 9 |
| 1 |
| 3 |
| 1 |
| 6 |
=
| 1 |
| 9 |
| 1 |
| 3 |
| 1 |
| 6 |
=4+12-6
=16-6
=10;
(2)3-
| 5 |
| 8 |
| 25 |
| 28 |
| 3 |
| 10 |
=3-
| 7 |
| 10 |
| 3 |
| 10 |
=3-(
| 7 |
| 10 |
| 3 |
| 10 |
=3-1
=2;
(3)(0.25-
| 3 |
| 16 |
| 1 |
| 2 |
| 1 |
| 4 |
=
| 1 |
| 16 |
| 1 |
| 4 |
=
| 1 |
| 4 |
(4)
| 5 |
| 14 |
| 15 |
| 28 |
| 3 |
| 10 |
=
| 2 |
| 3 |
| 3 |
| 10 |
=
| 29 |
| 30 |
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
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