16(x+2)²-81=0
已知X不等于0,且M=(X²+2X+1)(X-2X+1),N=(X²+X+1)(x²-X+
2x²+3x-2=0 6x²+7x-3=0 3x²-14+16=0 (3x+2)²
解方程(1)x²-6x-6=0 (2)x²-2x-1=0 (3)x(x+8)=16
(x-2)²=(2x-3)² x²-4x=0 3x(x+1)=3x+3 x²-2
已知x≠0,且M=(x²+2x+1)(x²-2x+1),N=(x²+x+1)(x²
x²+3x-1=0,1/(x-2)×(x²-4x+4)/(x+1)-(x-1)/(x+2)
已知(x+根号二)/(x-2)÷(x²+4x+4)/(x²-4),其中x满足(x-2)(x+3)=0
解方程①(x+3/x-1)²-5(x+3/x-1)+6=0 ②x²-2/x+3-6x+18/x
28(6):函数f(x)={log2(x),(x>0);-x²-2x+1,x≤0},若关于x的方程f[f(x)
f(x)=x²+3x|x-2|
f(x)=-x^2+2x(x>0) 0(x=0) x^2-2x(x
3x²+6x+3=0 2x²-6x-20=0 4x²-x-18=0 4x²=81