(1)已知(x-1)x+2=1,求整数x的值;(2)已知3x=4,3y=6,求9x-y+27x-y的值.
问题描述:
(1)已知(x-1)x+2=1,求整数x的值;(2)已知3x=4,3y=6,求9x-y+27x-y的值.
答
①(x-1)x+2=1
x+1x+2=1
2x=-1
x=-1/2
x=-0.5