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解方程(任选两题):
(1)2t-4=3t+5;
(2)
1
2
(7-4x)=6+
3
2
(4x-7);
(3)5(x-2)=4-(4-x);
(4)
1−y
3
-y=3-
y+2
4

(5)
1.5x−1
3
-
x
0.6
=0.5.
人气:158 ℃ 时间:2020-04-09 12:44:20
解答
(1)整理,得2t-3t=5+4,-t=9,
解得t=-9;
(2)整理,得7-4x=12+12x-21,
移项得,-4x-12x=12-21-7,
合并同类项得,-16x=-16,
解得x=1;
(3)整理,得5x-10=4-4+x,
移项得,5x-x=10,
合并同类项得,4x=10,
解得x=
5
2

(4)整理,得4(1-y)-12y=36-3(y+2),
去括号得,4-4y-12y=36-3y-6,
移项合并同类项得,-13y=26,
解得y=-2;
(5)整理,得1.5x-1-5x=1.5,
合并同类项得,-3.5x=2.5,
解得x=-
5
7
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