题目内容
用你喜欢的方法计算.
-(
+
)
-(
-
)
-
+
.
| 5 |
| 6 |
| 1 |
| 3 |
| 3 |
| 10 |
| 7 |
| 8 |
| 2 |
| 5 |
| 1 |
| 10) |
| 4 |
| 5 |
| 13 |
| 16 |
| 3 |
| 16 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)先算加法,再算减法;
(2)先算小括号里面的减法,再算括号外面的减法;
(3)根据减法的性质进行简算.
(2)先算小括号里面的减法,再算括号外面的减法;
(3)根据减法的性质进行简算.
解答:
解:(1)
-(
+
)
=
-
=
;
(2)
-(
-
)
=
-
=
;
(3)
-
+
=
-(
-
)
=
-
=
.
| 5 |
| 6 |
| 1 |
| 3 |
| 3 |
| 10 |
=
| 5 |
| 6 |
| 19 |
| 30 |
=
| 1 |
| 5 |
(2)
| 7 |
| 8 |
| 2 |
| 5 |
| 1 |
| 10 |
=
| 7 |
| 8 |
| 3 |
| 10 |
=
| 23 |
| 40 |
(3)
| 4 |
| 5 |
| 13 |
| 16 |
| 3 |
| 16 |
=
| 4 |
| 5 |
| 13 |
| 16 |
| 3 |
| 16 |
=
| 4 |
| 5 |
| 5 |
| 8 |
=
| 7 |
| 40 |
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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