2x减去二分之一{X-二分之一(x-1)}=三分之二(x-1)
问题描述:
2x减去二分之一{X-二分之一(x-1)}=三分之二(x-1)
答
2X-1/2{X-1/2(X-1)}=2/3(X-1)
2X-1/2X+1/4(X-1)=2/3(X-1)
3/2X=2/3(X-1)-1/4(X-1)=5/12(X-1)=5/12X-5/12
13/12x= -5/12
x=-5/12*12/13
X=-5/13
答
2x-1/2[x-1/2(x-1)]=2/3(x-1)
12x-3[x-1/2x+1/2]=4(x-1)
12x-3x/2-3/2=4x-4
24x-3x-3=8x-8
24x-3x-8x=-8+3
13x=-5
x=-5/13