题目内容
我会解方程.
|
x÷
| ||||||||||
|
37.5%-
| ||||||||||
x×(
|
|
分析:(1)先化简方程,再依据等式的性质,方程两边同时除以
求解,
(2)依据等式的性质,方程两边同时乘
求解,
(3)依据等式的性质,方程两边同时加x,再同时减
求解,
(4)依据等式的性质,方程两边同时乘加
x,再同时减
,最后同时除以
求解,
(5)先化简方程,再依据等式的性质,方程两边同时除以
求解,
(6)依据等式的性质,方程两边同时除以
求解.
| 4 |
| 5 |
(2)依据等式的性质,方程两边同时乘
| 3 |
| 8 |
(3)依据等式的性质,方程两边同时加x,再同时减
| 5 |
| 16 |
(4)依据等式的性质,方程两边同时乘加
| 3 |
| 16 |
| 3 |
| 8 |
| 3 |
| 16 |
(5)先化简方程,再依据等式的性质,方程两边同时除以
| 35 |
| 24 |
(6)依据等式的性质,方程两边同时除以
| 3 |
| 9 |
解答:解:(1)
x+
x=36
x=36
x÷
=36÷
x=45;
(2)x÷
=
x÷
×
=
×
x=
;
(3)
-x=
-x+x=
+x
-
=
+x-
x=
;
(4)37.5%-
x=
37.5%-
x+
x=
+
x
37.5%-
=
+
x-
0÷
=
x÷
x=0;
(5)x×(
+
)=
x×
=
x×
÷
=
÷
x=
;
(6)
x=
x÷
=
÷
x=2
.
| 3 |
| 5 |
| 1 |
| 5 |
| 4 |
| 5 |
| 4 |
| 5 |
| 4 |
| 5 |
| 4 |
| 5 |
x=45;
(2)x÷
| 3 |
| 8 |
| 1 |
| 12 |
x÷
| 3 |
| 8 |
| 3 |
| 8 |
| 1 |
| 12 |
| 3 |
| 8 |
x=
| 1 |
| 32 |
(3)
| 5 |
| 8 |
| 5 |
| 16 |
| 5 |
| 8 |
| 5 |
| 16 |
| 5 |
| 8 |
| 5 |
| 16 |
| 5 |
| 16 |
| 5 |
| 16 |
x=
| 5 |
| 16 |
(4)37.5%-
| 3 |
| 16 |
| 3 |
| 8 |
37.5%-
| 3 |
| 16 |
| 3 |
| 16 |
| 3 |
| 8 |
| 3 |
| 16 |
37.5%-
| 3 |
| 8 |
| 3 |
| 8 |
| 3 |
| 16 |
| 3 |
| 8 |
0÷
| 3 |
| 16 |
| 3 |
| 16 |
| 3 |
| 16 |
x=0;
(5)x×(
| 5 |
| 6 |
| 5 |
| 8 |
| 5 |
| 8 |
x×
| 35 |
| 24 |
| 5 |
| 8 |
x×
| 35 |
| 24 |
| 35 |
| 24 |
| 5 |
| 8 |
| 35 |
| 24 |
x=
| 3 |
| 7 |
(6)
| 3 |
| 9 |
| 5 |
| 6 |
| 3 |
| 9 |
| 3 |
| 9 |
| 5 |
| 6 |
| 3 |
| 9 |
x=2
| 1 |
| 2 |
点评:等式的性质是解方程的依据,解方程时注意对齐等号.
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