作业帮1.(8xy-x²+y²)-(x²-y²+8xy)2.(2x²-1/2+3x)-4(x-x²+1/2)3.3x²-[7x-(4x-3)-2x²]
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/04 14:36:00
![1.(8xy-x²+y²)-(x²-y²+8xy)2.(2x²-1/2+3x)-4(x-x²+1/2)3.3x²-[7x-(4x-3)-2x²]](/uploads/image/z/1268825-41-5.jpg?t=1.%288xy-x%26sup2%3B%2By%26sup2%3B%29-%28x%26sup2%3B-y%26sup2%3B%2B8xy%292.%282x%26sup2%3B-1%2F2%2B3x%29-4%28x-x%26sup2%3B%2B1%2F2%293.3x%26sup2%3B-%5B7x-%284x-3%29-2x%26sup2%3B%5D)
1.(8xy-x²+y²)-(x²-y²+8xy)2.(2x²-1/2+3x)-4(x-x²+1/2)3.3x²-[7x-(4x-3)-2x²]
1.(8xy-x²+y²)-(x²-y²+8xy)
2.(2x²-1/2+3x)-4(x-x²+1/2)
3.3x²-[7x-(4x-3)-2x²]
1.(8xy-x²+y²)-(x²-y²+8xy)2.(2x²-1/2+3x)-4(x-x²+1/2)3.3x²-[7x-(4x-3)-2x²]
1、(8xy-x²+y²)-(x²-y²+8xy)=[8xy-(x²-y²)][8xy+(x²-y²)]
=64x²y²-(x²-y²)=64x²y²-x^4+2x²y²-y^4=66x²y²-x^4-y^4
2、 (2x²-1/2+3x)-4(x-x²+1/2)= 2x²-1/2+3x-4x+4x²-2
= 6x²-x-2.5
3、3x²-[7x-(4x-3)-2x²]=3x²-7x+(4x-3)+2x²
=5x²-7x+4x-3=5x²-3x-3
（8xy-x²+y²)-(x²-y²+8xy)
=8撒啊就擦不好啊啊
=8973425928562958
1)=8xy-x@+y@-x@+y@-8xy
=2y@-2x@
@为平方
2)=2x@-1/2+3x-4x+4X@-2
=6x@-x-5/2
3)=3x@-(7x-4x+3-2x@)
=3x@-7x+4x-3+2x@
=5x@-3X-3
linkqlj 第一题错了吧初一那呢么南？
1题=8XY-X^2+Y^2-X^2+Y^2-8XY
=(8XY-8XY)-2X^2+2Y^2
=2Y^2-2X^2
2题=2X^2-1/2+3X-4X+4X^2-2
=6X^2-X-2.5
3题=3X^2-7X+4X-3+2X^2
=5X^2-3X-3