Question

①X平方+2X分之X+2-X平方-4X+4分之X-1

Answer 1

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);

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