①已知y=1/3乘以x-1,那么1/3乘以x²-2xy+3y²-2的值是:

问题描述:

①已知y=1/3乘以x-1,那么1/3乘以x²-2xy+3y²-2的值是:
②因式分解:x的四次方-y的四次方
③已知x(x-1)-(x²-y)=-3,求x²+y²-2xy的值
④分解因式:(4a²+1)²-16a²

①=1/9乘以(4x²-4x-3)
②=(x²-y²)(x²+y²)
③=9
④=(4a²-1)²