1.解下列方程:
问题描述:
1.解下列方程:
(1)5(x+2)=2(5x-1);
(2) (x+1)-2(x-1)=1-3x;
(3) 2(x-2)-(4x-1)=3(1-x).
2.列方程求解:
(1)当x取何值时,代数式3(2-x)和2(3+x)的值相等?
(2)当y取何值时,2(3y+4)的值比5(2y-7)的值大3?
答
1
(1)5x+10=10x-2
10+2=10x-5x
12=5x
x=12/5
(2)x+1-2x+2=1-3x
x-2x+3x=1-1-2
x=-1
(3)2x-4-4x+1=3-3x
2x+3x-4x=3+4-1
x=6
2
(1)3(2-x)=2(3+x)
6-3x=6+2x
x=0
(2)2(3y+4)-5(2y-7)=3
6y+8-10y+35=3
y=10