①X平方+2X分之X+2-X平方-4X+4分之X-1
=(x+2)/x(x+2)-(x-1)/(x-2)²
=[(x-2)²-x²+x]/x(x-2)²;
=(4-3x)/x(x-2)²;
②(x-y)²+3(x²-3分之1又y²)
=x²-2xy+y²+3x²-y²
=4x²-2xy;
=2x(2x-y);
手机提问的朋友在客户端右上角评价点【满意】即可.第一道题完整的是（X平方+2X分之X+2-X平方-4X+4分之X-1）÷x分之x-4乘(2-x)²
能帮我再做下么？（X平方+2X分之X+2-X平方-4X+4分之X-1）÷x分之x-4乘(2-x)²

=【（x+2）/x(x+2)-(x-1)/(x-2)²]×x/(x-4)×(2-x)²;
=(1/x-(x-1)/(x-2)²)×x(2-x)²/(x-4);
=[(x-2)²-x²+x]/x(x-2)²×x(2-x)²/(x-4)
=(4-3x)/(x-4);