题目内容
计算(能用简便方法的用简便方法)
(1)
-
+
(2)5-
-
(3)
+
+
+
(4)
-(
-
)
(1)
4 |
5 |
3 |
10 |
2 |
3 |
(2)5-
9 |
16 |
7 |
16 |
(3)
5 |
12 |
3 |
7 |
4 |
7 |
7 |
12 |
(4)
5 |
6 |
1 |
2 |
1 |
3 |
考点:分数的四则混合运算,分数的简便计算
专题:运算顺序及法则,运算定律及简算
分析:(1)按照从左向右的顺序进行计算;
(2)根据减法的性质进行简算;
(3)根据加法交换律和结合律进行简算;
(4)先算小括号里面的减法,再算括号外面的减法.
(2)根据减法的性质进行简算;
(3)根据加法交换律和结合律进行简算;
(4)先算小括号里面的减法,再算括号外面的减法.
解答:
解:(1)
-
+
=
+
=
;
(2)5-
-
=5-(
+
)
=5-1
=4;
(3)
+
+
+
=(
+
)+(
+
)
=1+1
=2;
(4)
-(
-
)
=
-
=
.
4 |
5 |
3 |
10 |
2 |
3 |
=
1 |
2 |
2 |
3 |
=
7 |
6 |
(2)5-
9 |
16 |
7 |
16 |
=5-(
9 |
16 |
7 |
16 |
=5-1
=4;
(3)
5 |
12 |
3 |
7 |
4 |
7 |
7 |
12 |
=(
5 |
12 |
7 |
12 |
3 |
7 |
4 |
7 |
=1+1
=2;
(4)
5 |
6 |
1 |
2 |
1 |
3 |
=
5 |
6 |
1 |
6 |
=
2 |
3 |
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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