题目内容
解方程:
(1)2x-3-(x-1)=3x;
(2)x-5=3x-2(1-x);
(3)x-2(1-0.5x)=1.5x+2(0.5-0.5x);
(4)2(x-2)-3(4x-1)=9(1-x);
(5)6-3(x+
)=
;
(6)
(x-1)=2-
(x+2);
(7)(x+1)-2(x-1)=1-3x;
(8)2(x-2)-6(x-1)=3(1-x);
(9)3-x=2-5(x-1);
(10)2(x-1)=4;
(11)15-(8-5x)=7x+(4-3x).
(1)2x-3-(x-1)=3x;
(2)x-5=3x-2(1-x);
(3)x-2(1-0.5x)=1.5x+2(0.5-0.5x);
(4)2(x-2)-3(4x-1)=9(1-x);
(5)6-3(x+
| 2 |
| 3 |
| 2 |
| 3 |
(6)
| 1 |
| 2 |
| 1 |
| 5 |
(7)(x+1)-2(x-1)=1-3x;
(8)2(x-2)-6(x-1)=3(1-x);
(9)3-x=2-5(x-1);
(10)2(x-1)=4;
(11)15-(8-5x)=7x+(4-3x).
考点:解一元一次方程
专题:
分析:(1)去括号,移项,合并同类项,系数化成1即可;
(2)去括号,移项,合并同类项,系数化成1即可;
(3)去括号,移项,合并同类项,系数化成1即可;
(4)去括号,移项,合并同类项,系数化成1即可;
(5)去括号,移项,合并同类项,系数化成1即可;
(6)去括号,移项,合并同类项,系数化成1即可;
(7)去括号,移项,合并同类项,系数化成1即可;
(8)去括号,移项,合并同类项,系数化成1即可;
(9)去括号,移项,合并同类项,系数化成1即可;
(10)去括号,移项,合并同类项,系数化成1即可;
(11)去括号,移项,合并同类项,系数化成1即可.
(2)去括号,移项,合并同类项,系数化成1即可;
(3)去括号,移项,合并同类项,系数化成1即可;
(4)去括号,移项,合并同类项,系数化成1即可;
(5)去括号,移项,合并同类项,系数化成1即可;
(6)去括号,移项,合并同类项,系数化成1即可;
(7)去括号,移项,合并同类项,系数化成1即可;
(8)去括号,移项,合并同类项,系数化成1即可;
(9)去括号,移项,合并同类项,系数化成1即可;
(10)去括号,移项,合并同类项,系数化成1即可;
(11)去括号,移项,合并同类项,系数化成1即可.
解答:解:(1)2x-3-(x-1)=3x,
2x-3-x+1=3x,
2x-x-3x=3-1,
-2x=2,
x=-1;
(2)x-5=3x-2(1-x),
x-5=3x-2+2x,
x-3x-2x=5-2,
-4x=3,
x=-
;
(3)x-2(1-0.5x)=1.5x+2(0.5-0.5x),
x-2+x=1.5x+1-x,
x+x-1.5x+x=1+2,
1.5x=3,
x=2;
(4)2(x-2)-3(4x-1)=9(1-x),
2x-4-12x+3=9-9x,
2x-12x+9x=9+4-3,
-x=10,
x=-10;
(5)6-3(x+
)=
,
6-3x-2=
,
-3x=
+2-6,
-3x=-
,
x=
;
(6)
(x-1)=2-
(x+2),
x-
=2-
x-
,
x+
x=
-
,
x=
,
x=7;
(7)(x+1)-2(x-1)=1-3x,
x+1-2x+2=1-3x,
x-2x+3x=1-1-2,
2x=-2,
x=-1;
(8)2(x-2)-6(x-1)=3(1-x)
2x-4-6x+6=3-3x,
2x-6x+3x=3+4-6,
-x=1,
x=-1;
(9)3-x=2-5(x-1),
3-x=2-5x+5,
-x+5x=2+5-3,
4x=4,
x=1;
(10)2(x-1)=4,
2x-2=4,
2x=6,
x=3;
(11)15-(8-5x)=7x+(4-3x),
15-8+5x=7x+4-3x,
5x-7x+3x=4-15+8,
x=-3.
2x-3-x+1=3x,
2x-x-3x=3-1,
-2x=2,
x=-1;
(2)x-5=3x-2(1-x),
x-5=3x-2+2x,
x-3x-2x=5-2,
-4x=3,
x=-
| 3 |
| 4 |
(3)x-2(1-0.5x)=1.5x+2(0.5-0.5x),
x-2+x=1.5x+1-x,
x+x-1.5x+x=1+2,
1.5x=3,
x=2;
(4)2(x-2)-3(4x-1)=9(1-x),
2x-4-12x+3=9-9x,
2x-12x+9x=9+4-3,
-x=10,
x=-10;
(5)6-3(x+
| 2 |
| 3 |
| 2 |
| 3 |
6-3x-2=
| 2 |
| 3 |
-3x=
| 2 |
| 3 |
-3x=-
| 10 |
| 3 |
x=
| 10 |
| 9 |
(6)
| 1 |
| 2 |
| 1 |
| 5 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 5 |
| 2 |
| 5 |
| 1 |
| 2 |
| 1 |
| 5 |
| 1 |
| 2 |
| 2 |
| 5 |
| 7 |
| 10 |
| 1 |
| 10 |
x=7;
(7)(x+1)-2(x-1)=1-3x,
x+1-2x+2=1-3x,
x-2x+3x=1-1-2,
2x=-2,
x=-1;
(8)2(x-2)-6(x-1)=3(1-x)
2x-4-6x+6=3-3x,
2x-6x+3x=3+4-6,
-x=1,
x=-1;
(9)3-x=2-5(x-1),
3-x=2-5x+5,
-x+5x=2+5-3,
4x=4,
x=1;
(10)2(x-1)=4,
2x-2=4,
2x=6,
x=3;
(11)15-(8-5x)=7x+(4-3x),
15-8+5x=7x+4-3x,
5x-7x+3x=4-15+8,
x=-3.
点评:本题考查了解一元一次方程的应用,注意:解一元一次方程的步骤是去分母,去括号,移项,合并同类项,系数化成1.
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