题目内容
用你喜欢的方法算:
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(
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分析:(1)根据四则混合运算的运算顺序计算即可:先算乘法,再算加法;
(2)(3)(5)(6)可根据乘法分配律计算;
(4)可根据乘法交换律计算.
(2)(3)(5)(6)可根据乘法分配律计算;
(4)可根据乘法交换律计算.
解答:解:(1)
+
×
.
=
+
,
=
;
(2)
×
+
×
=(
+
)×
,
=1×
,
=
;
(3)
×9+
=(9+1)×
,
=10×
,
=
;
(4)
÷
×
=
×
×
,
=
;
(5)(
+
)÷
=
÷
+
×
,
=1+1
,
=2
;
(6)
÷
+
×
=
×
+
×
,
=(
+
)×
,
=1×
,
=
.
1 |
4 |
3 |
4 |
1 |
3 |
=
1 |
4 |
1 |
4 |
=
1 |
2 |
(2)
5 |
7 |
1 |
4 |
3 |
4 |
5 |
7 |
=(
1 |
4 |
3 |
4 |
5 |
7 |
=1×
5 |
7 |
=
5 |
7 |
(3)
7 |
8 |
7 |
8 |
=(9+1)×
7 |
8 |
=10×
7 |
8 |
=
35 |
4 |
(4)
10 |
21 |
25 |
12 |
7 |
8 |
=
10 |
21 |
7 |
8 |
12 |
25 |
=
1 |
5 |
(5)(
3 |
5 |
3 |
4 |
3 |
5 |
=
3 |
5 |
3 |
5 |
3 |
4 |
5 |
3 |
=1+1
1 |
4 |
=2
1 |
4 |
(6)
3 |
7 |
7 |
11 |
4 |
7 |
11 |
7 |
=
3 |
7 |
11 |
7 |
4 |
7 |
11 |
7 |
=(
3 |
7 |
4 |
7 |
11 |
7 |
=1×
11 |
7 |
=
11 |
7 |
点评:完成本题要注意分析式中数据的特点,然后运用合适的方法计算.
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