利用等式的性质解下列方程. (1)y+3=2; (2)-1/2y-2=3; (3)9x=8x-6; (4)8m=4m+1.
问题描述:
利用等式的性质解下列方程.
(1)y+3=2; (2)-
y-2=3;1 2
(3)9x=8x-6; (4)8m=4m+1.
答
(1)y+3-3=2-3,
y=-1;
(2)-
y-2+2=3+2,1 2
-
y=5,1 2
y=-10;
(3)9x-8x=8x-6-8x,
x=-6;
(4)8m-4m=4m+1-4m,
4m=1,
m=
.1 4