计算:2X²-3X+1与-3X²+5X-7的和.还有……:-X²+3XY-0.5y²与-0.25X²+4XY-二分之三Y²的差
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![计算:2X²-3X+1与-3X²+5X-7的和.还有……:-X²+3XY-0.5y²与-0.25X²+4XY-二分之三Y²的差](/uploads/image/z/744906-66-6.jpg?t=%E8%AE%A1%E7%AE%97%EF%BC%9A2X%26%23178%3B-3X%2B1%E4%B8%8E-3X%26%23178%3B%2B5X-7%E7%9A%84%E5%92%8C.%E8%BF%98%E6%9C%89%E2%80%A6%E2%80%A6%EF%BC%9A-X%26%23178%3B%2B3XY-0.5y%26%23178%3B%E4%B8%8E-0.25X%26%23178%3B%2B4XY-%E4%BA%8C%E5%88%86%E4%B9%8B%E4%B8%89Y%26%23178%3B%E7%9A%84%E5%B7%AE)
计算:2X²-3X+1与-3X²+5X-7的和.还有……:-X²+3XY-0.5y²与-0.25X²+4XY-二分之三Y²的差
计算:2X²-3X+1与-3X²+5X-7的和.
还有……:-X²+3XY-0.5y²与-0.25X²+4XY-二分之三Y²的差
计算:2X²-3X+1与-3X²+5X-7的和.还有……:-X²+3XY-0.5y²与-0.25X²+4XY-二分之三Y²的差
2X²-3X+1+(-3X²+5X-7)
=(2-3)x^2+(-3+5)x+(1-7)
=-x^2+2x-6
-X²+3XY-0.5y²-(-0.25X²+4XY-二分之三Y^2)
=(-1+0.25)x^2+(3+4)xy+(-0.5+3/2)y^2
=-0.75x^2+7xy+y^2