化简、、、最好有过程x²y-3xy²+2yx²-y²x2、(3a²-ab+7)-(5ab-4a²+7)3、2(x-x²+1)-3(x²+x)
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![化简、、、最好有过程x²y-3xy²+2yx²-y²x2、(3a²-ab+7)-(5ab-4a²+7)3、2(x-x²+1)-3(x²+x)](/uploads/image/z/3933893-29-3.jpg?t=%E5%8C%96%E7%AE%80%E3%80%81%E3%80%81%E3%80%81%E6%9C%80%E5%A5%BD%E6%9C%89%E8%BF%87%E7%A8%8Bx%26%23178%3By-3xy%26%23178%3B%2B2yx%26%23178%3B-y%26%23178%3Bx2%E3%80%81%EF%BC%883a%26%23178%3B-ab%2B7%EF%BC%89-%EF%BC%885ab-4a%26%23178%3B%2B7%EF%BC%893%E3%80%812%EF%BC%88x-x%26%23178%3B%2B1%EF%BC%89-3%EF%BC%88x%26%23178%3B%2Bx%EF%BC%89)
化简、、、最好有过程x²y-3xy²+2yx²-y²x2、(3a²-ab+7)-(5ab-4a²+7)3、2(x-x²+1)-3(x²+x)
化简、、、最好有过程
x²y-3xy²+2yx²-y²x
2、(3a²-ab+7)-(5ab-4a²+7)
3、2(x-x²+1)-3(x²+x)
化简、、、最好有过程x²y-3xy²+2yx²-y²x2、(3a²-ab+7)-(5ab-4a²+7)3、2(x-x²+1)-3(x²+x)
1.原式=(x²y+2yx²)-(y²x-3xy²)
=3x²y-(-2xy²)
=3x²y+2xy²
2.原式=3a²-ab+7-5ab+4a²-7
= (3a²+4a²)-(ab+5ab)-7+7
=7a²-6ab
3.原式=2x-2x²+2-3x²-3x
=-2x²-3x²-3x+2x+2
=-5x²-x+2