题目内容
简算.
|
|
|
考点:分数的简便计算
专题:运算定律及简算
分析:(1)根据加法交换律和结合律简算;
(2)先把除法变成乘法,再运用乘法分配律简算;
(3)根据加法交换律和减法的性质简算.
(2)先把除法变成乘法,再运用乘法分配律简算;
(3)根据加法交换律和减法的性质简算.
解答:
解:(1)
+6.75+
+25%
=(
+
)+(6.75+25%)
=1+7
=8;
(2)
×
+
÷4
=
×
+
×
=(
+
)×
=1×
=
;
(3)
-
+
-
=(
+
)-(
+
)
=1-1
=0.
9 |
20 |
11 |
20 |
=(
9 |
20 |
11 |
20 |
=1+7
=8;
(2)
3 |
5 |
1 |
4 |
2 |
5 |
=
3 |
5 |
1 |
4 |
2 |
5 |
1 |
4 |
=(
3 |
5 |
2 |
5 |
1 |
4 |
=1×
1 |
4 |
=
1 |
4 |
(3)
7 |
9 |
7 |
8 |
2 |
9 |
1 |
8 |
=(
7 |
9 |
2 |
9 |
7 |
8 |
1 |
8 |
=1-1
=0.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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