2-[(x-y²)(3x+y)-(x+y)(3x-y²)]÷xy
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2-[(x-y²)(3x+y)-(x+y)(3x-y²)]÷xy
等于多少?
2、若不论x为何值,(ax+b)(x+2)=x²-4,则a的b次方是多少?
3、已知x²+x-1=0,求2x的四次+2x的三次+2x+3 等于多少?
等于多少?
2、若不论x为何值,(ax+b)(x+2)=x²-4,则a的b次方是多少?
3、已知x²+x-1=0,求2x的四次+2x的三次+2x+3 等于多少?
![2-[(x-y²)(3x+y)-(x+y)(3x-y²)]÷xy](/uploads/image/z/19148432-32-2.jpg?t=2-%5B%28x-y%26%23178%3B%29%EF%BC%883x%EF%BC%8By%EF%BC%89-%28x%2By%29%EF%BC%883x-y%26%23178%3B%EF%BC%89%5D%C3%B7xy)
1、 2(y+2)
2、a=1,b=-2
3、 5
2、a=1,b=-2
3、 5
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