Question

一元一次方程求解(1)5-3（x-1）=2-4(x+2)(2)0.5分之x-3-0.3分之x-4=1(3)(m+1)x=

Answer 1

(1)5-3x+3=2-4x-8,8-3x=-6-4x,x=-14

(2)0.3(x-3)-0.5(x-4)=0.15,30(x-3)-50(x-4)=15,4x=19,x=19/4

(3)(m+2)x=n,x=n/(m+2)

(4)3x-2m+1=0,x=(2m+1)/3

2-m=2-2x,x=m/2

(2m+1)/3=-m/2

m=-2/7

代入原式,x=1/7,x=-1/7

(5)7x-6x=-4,x=-4

(6)x=74+15,x=89

(7)3x-2x=5,x=5

(8)-5x+4x=8,x=-8