-3x 2+12xy 2-6xy怎么算?还有:x^2(a-b)+y(a-b)和x^2(a-b)+y(b-a)和5a^2b(x-y)^3-30ab^2(y-x)^2还有两题:1.在半径为R的圆形上,挖去4个半径的小圆。求剩余部分的面积S,当R=7.2cm,r=1.4时 2.已知m^2+n^2+2m-6n+10=0求m、n
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![-3x 2+12xy 2-6xy怎么算?还有:x^2(a-b)+y(a-b)和x^2(a-b)+y(b-a)和5a^2b(x-y)^3-30ab^2(y-x)^2还有两题:1.在半径为R的圆形上,挖去4个半径的小圆。求剩余部分的面积S,当R=7.2cm,r=1.4时 2.已知m^2+n^2+2m-6n+10=0求m、n](/uploads/image/z/3176011-19-1.jpg?t=-3x+2%2B12xy+2-6xy%E6%80%8E%E4%B9%88%E7%AE%97%3F%E8%BF%98%E6%9C%89%EF%BC%9Ax%5E2%28a-b%29%2By%28a-b%29%E5%92%8Cx%5E2%28a-b%29%2By%28b-a%29%E5%92%8C5a%5E2b%28x-y%29%5E3-30ab%5E2%28y-x%29%5E2%E8%BF%98%E6%9C%89%E4%B8%A4%E9%A2%98%EF%BC%9A1.%E5%9C%A8%E5%8D%8A%E5%BE%84%E4%B8%BAR%E7%9A%84%E5%9C%86%E5%BD%A2%E4%B8%8A%2C%E6%8C%96%E5%8E%BB4%E4%B8%AA%E5%8D%8A%E5%BE%84%E7%9A%84%E5%B0%8F%E5%9C%86%E3%80%82%E6%B1%82%E5%89%A9%E4%BD%99%E9%83%A8%E5%88%86%E7%9A%84%E9%9D%A2%E7%A7%AFS%2C%E5%BD%93R%3D7.2cm%2Cr%3D1.4%E6%97%B6+2.%E5%B7%B2%E7%9F%A5m%5E2%2Bn%5E2%2B2m-6n%2B10%3D0%E6%B1%82m%E3%80%81n)
-3x 2+12xy 2-6xy怎么算?还有:x^2(a-b)+y(a-b)和x^2(a-b)+y(b-a)和5a^2b(x-y)^3-30ab^2(y-x)^2还有两题:1.在半径为R的圆形上,挖去4个半径的小圆。求剩余部分的面积S,当R=7.2cm,r=1.4时 2.已知m^2+n^2+2m-6n+10=0求m、n
-3x 2+12xy 2-6xy怎么算?
还有:x^2(a-b)+y(a-b)和x^2(a-b)+y(b-a)和5a^2b(x-y)^3-30ab^2(y-x)^2
还有两题:1.在半径为R的圆形上,挖去4个半径的小圆。求剩余部分的面积S,当R=7.2cm,r=1.4时 2.已知m^2+n^2+2m-6n+10=0求m、n的值(我加20悬赏分)在2011年4月19日10:15前必须有答案!否则悬赏分无效!
-3x 2+12xy 2-6xy怎么算?还有:x^2(a-b)+y(a-b)和x^2(a-b)+y(b-a)和5a^2b(x-y)^3-30ab^2(y-x)^2还有两题:1.在半径为R的圆形上,挖去4个半径的小圆。求剩余部分的面积S,当R=7.2cm,r=1.4时 2.已知m^2+n^2+2m-6n+10=0求m、n
-3x^2+12xy^2-6xy
=-3x(x-4y^2+2y)
x^2(a-b)+y(a-b)
=(x^2+y)(a-b)
x^2(a-b)+y(b-a)
=x^2(a-b)-y(a-b)
=(x^2-y)(a-b)
5a^2b(x-y)^3-30ab^2(y-x)^2
=5a^2b(x-y)^3-30ab^2(x-y)^2
=5ab(x-y)^2[a(x-y)-6b]
=5ab(x-y)^2(ax-ay-6b)