题目内容
脱式计算:
|
|
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1-
|
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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)通分计算即可;
(2)运用加法的交换律进行简算;
(3)先算小括号里的减法,再算括号外的加法;
(4)去括号,先算减法,再算加法;
(5)运用减法的性质进行简算;
(6)运用加法的交换律、结合律,减法的性质进行简算.
(2)运用加法的交换律进行简算;
(3)先算小括号里的减法,再算括号外的加法;
(4)去括号,先算减法,再算加法;
(5)运用减法的性质进行简算;
(6)运用加法的交换律、结合律,减法的性质进行简算.
解答:
解:(1)
-
+
=
+
=
;
(2)
+
+
=
+
+
=1+
=1
;
(3)
+(
-
)
=
+
=
;
(4)
-(
-
)
=
-
+
=0+
=
;
(5)1-
-
=1-(
+
)
=1-1
=0;
(6)
+
+
-
=
+
+
-
=(
+
)+(
-
)
=1+
=1
.
| 3 |
| 4 |
| 3 |
| 8 |
| 7 |
| 12 |
=
| 3 |
| 8 |
| 7 |
| 12 |
=
| 23 |
| 24 |
(2)
| 5 |
| 13 |
| 1 |
| 6 |
| 8 |
| 13 |
=
| 5 |
| 13 |
| 8 |
| 13 |
| 1 |
| 6 |
=1+
| 1 |
| 6 |
=1
| 1 |
| 6 |
(3)
| 2 |
| 5 |
| 5 |
| 6 |
| 1 |
| 3 |
=
| 2 |
| 5 |
| 1 |
| 2 |
=
| 9 |
| 10 |
(4)
| 6 |
| 7 |
| 6 |
| 7 |
| 2 |
| 3 |
=
| 6 |
| 7 |
| 6 |
| 7 |
| 2 |
| 3 |
=0+
| 2 |
| 3 |
=
| 2 |
| 3 |
(5)1-
| 2 |
| 7 |
| 5 |
| 7 |
=1-(
| 2 |
| 7 |
| 5 |
| 7 |
=1-1
=0;
(6)
| 11 |
| 19 |
| 7 |
| 18 |
| 8 |
| 19 |
| 1 |
| 18 |
=
| 11 |
| 19 |
| 8 |
| 19 |
| 7 |
| 18 |
| 1 |
| 18 |
=(
| 11 |
| 19 |
| 8 |
| 19 |
| 7 |
| 18 |
| 1 |
| 18 |
=1+
| 1 |
| 3 |
=1
| 1 |
| 3 |
点评:此题考查了分数的四则混合运算,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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