题目内容
| 计算下面各题,能简算的要简算. 1-
| 10-(
|
|
|
考点:分数的四则混合运算,运算定律与简便运算
专题:运算顺序及法则,运算定律及简算
分析:(1)根据减法的性质进行简算;
(2)先算加法,再算减法;
(3)根据加法交换律和结合律进行简算;
(4)根据减法的性质进行简算.
(2)先算加法,再算减法;
(3)根据加法交换律和结合律进行简算;
(4)根据减法的性质进行简算.
解答:
解:(1)1-
-
-
=1-(
+
+
)
=1-1
=0;
(2)10-(
+
)
=10-
=9
;
(3)
+
+
+
=(
+
)+(
+
)
=
+1
=1
;
(4)
-(
-
)
=
-
+
=
+
-
=1-
=
.
| 4 |
| 13 |
| 5 |
| 13 |
| 4 |
| 13 |
=1-(
| 4 |
| 13 |
| 5 |
| 13 |
| 4 |
| 13 |
=1-1
=0;
(2)10-(
| 1 |
| 3 |
| 1 |
| 2 |
=10-
| 5 |
| 6 |
=9
| 1 |
| 6 |
(3)
| 1 |
| 7 |
| 2 |
| 9 |
| 4 |
| 7 |
| 7 |
| 9 |
=(
| 1 |
| 7 |
| 4 |
| 7 |
| 2 |
| 9 |
| 7 |
| 9 |
=
| 5 |
| 7 |
=1
| 5 |
| 7 |
(4)
| 9 |
| 19 |
| 8 |
| 9 |
| 10 |
| 19 |
=
| 9 |
| 19 |
| 8 |
| 9 |
| 10 |
| 19 |
=
| 9 |
| 19 |
| 10 |
| 19 |
| 8 |
| 9 |
=1-
| 8 |
| 9 |
=
| 1 |
| 9 |
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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