数学问题(英文)
1.expand(x+x)(y+y+y)2.simplify(2x^2-3x+1)-2(x^2+2x1)3.expand(2x^2-3x+1)(2-3x)4.ifthes...
1. expand (x+x)(y+y+y)
2. simplify (2x^2-3x+1)-2(x^2+2x1)
3. expand (2x^2-3x+1)(2-3x)
4. if the sum of the interior angels of convex n-sided polygon is 4 times the sum of the exterior angels of the polygon, find the value of n.
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2. simplify (2x^2-3x+1)-2(x^2+2x1)
3. expand (2x^2-3x+1)(2-3x)
4. if the sum of the interior angels of convex n-sided polygon is 4 times the sum of the exterior angels of the polygon, find the value of n.
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2个回答
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1、(x+x)(y+y+y)=6xy
2、 (2x^2-3x+1)-2(x^2+2x1)＝-3x-3
3、(2x^2-3x+1)(2-3x)=-6x^3+13x^2-9x+2
4、没看懂
2、 (2x^2-3x+1)-2(x^2+2x1)＝-3x-3
3、(2x^2-3x+1)(2-3x)=-6x^3+13x^2-9x+2
4、没看懂
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