题目内容
计算或解方程
|
|
76×
| ||||||||||||||||||||
|
|
x+
|
分析:(1)按从左到右的顺序计算即可;
(2)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;
(3)可将76拆分为75+1后根据乘法分配律计算;
(4)可根据乘法交换律及乘法分配律计算;
(5)可将方程两边同时减去
后,再同时除以
,即得x是多少.
(6)由于原方程可变为:
x=14,然后两边同时除以
即得x是多少.
(2)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;
(3)可将76拆分为75+1后根据乘法分配律计算;
(4)可根据乘法交换律及乘法分配律计算;
(5)可将方程两边同时减去
1 |
5 |
4 |
5 |
(6)由于原方程可变为:
7 |
4 |
7 |
4 |
解答:解:(1)
÷0.6×
=
×
×
,
=
×
,
=
;
(2)
+
×
+
=
+
+
,
=
+
,
=
;
(3)76×
=(75+1)×
,
=75×
+1×
,
=67+
,
=67
;
(4)
×
+
×
+
×
=
×
+
×
+
×
,
=(
+
+
)×
,
=
×
,
=
;
(5)
x+
=
x+
-
=
-
,
x=
,
x÷
=
÷
,
x=
.
(6)x+
x=14
x=14,
x÷
=14÷
,
x=8.
18 |
35 |
2 |
3 |
=
18 |
35 |
5 |
3 |
2 |
3 |
=
6 |
7 |
2 |
3 |
=
4 |
7 |
(2)
3 |
5 |
2 |
5 |
5 |
12 |
7 |
12 |
=
3 |
5 |
1 |
6 |
7 |
12 |
=
23 |
30 |
7 |
12 |
=
27 |
20 |
(3)76×
67 |
75 |
=(75+1)×
67 |
75 |
=75×
67 |
75 |
67 |
75 |
=67+
67 |
75 |
=67
67 |
75 |
(4)
5 |
6 |
1 |
13 |
5 |
9 |
2 |
13 |
5 |
18 |
6 |
13 |
=
1 |
6 |
5 |
13 |
2 |
9 |
5 |
13 |
6 |
18 |
5 |
13 |
=(
1 |
6 |
2 |
9 |
6 |
18 |
5 |
13 |
=
13 |
18 |
5 |
13 |
=
5 |
18 |
(5)
4 |
5 |
1 |
5 |
5 |
12 |
4 |
5 |
1 |
5 |
1 |
5 |
5 |
12 |
1 |
5 |
4 |
5 |
13 |
60 |
4 |
5 |
4 |
5 |
13 |
60 |
4 |
5 |
x=
13 |
48 |
(6)x+
3 |
4 |
7 |
4 |
7 |
4 |
7 |
4 |
7 |
4 |
x=8.
点评:在完成有关于分数的四则混合运算时要细心,注意通分、约分.
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