已知a=2x²-3xy+y²,b=x²+2xy-3y²,化简:(1)a+b (2)a-2b.请把过程也写出来,
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![已知a=2x²-3xy+y²,b=x²+2xy-3y²,化简:(1)a+b (2)a-2b.请把过程也写出来,](/uploads/image/z/5186181-21-1.jpg?t=%E5%B7%B2%E7%9F%A5a%3D2x%26sup2%3B-3xy%2By%26sup2%3B%2Cb%3Dx%26sup2%3B%2B2xy-3y%26sup2%3B%2C%E5%8C%96%E7%AE%80%EF%BC%9A%281%29a%2Bb+%282%29a-2b.%E8%AF%B7%E6%8A%8A%E8%BF%87%E7%A8%8B%E4%B9%9F%E5%86%99%E5%87%BA%E6%9D%A5%2C)
已知a=2x²-3xy+y²,b=x²+2xy-3y²,化简:(1)a+b (2)a-2b.请把过程也写出来,
已知a=2x²-3xy+y²,b=x²+2xy-3y²,化简:(1)a+b (2)a-2b.请把过程也写出来,
已知a=2x²-3xy+y²,b=x²+2xy-3y²,化简:(1)a+b (2)a-2b.请把过程也写出来,
a+b
=2x²-3xy+y²+x²+2xy-3y²
=3x²-xy-2y²
a-2b
=2x²-3xy+y²-2(x²+2xy-3y²)
=2x²-3xy+y²-2x²-4xy+6y²
=-7xy+7y²