给我15道关于多项式含有字母的计算题,
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给我15道关于多项式含有字母的计算题,
![给我15道关于多项式含有字母的计算题,](/uploads/image/z/15339601-1-1.jpg?t=%E7%BB%99%E6%88%9115%E9%81%93%E5%85%B3%E4%BA%8E%E5%A4%9A%E9%A1%B9%E5%BC%8F%E5%90%AB%E6%9C%89%E5%AD%97%E6%AF%8D%E7%9A%84%E8%AE%A1%E7%AE%97%E9%A2%98%2C)
1.(X+1)(X+2)(X+3)
=(X+2-1)(X+2)(X+2+1)
=(X+2)([(X+2)^2-1)
=(X+2)^3-(X+2)
=X^3+6X^2+12X+4-X-2
=X^3+6X^2+11X+2
2.(X-Y)平方-(X+Y)(X-Y)
=(X-Y)^2-(X^2-Y^2)
=X^2-2XY+Y^2-X^2+Y^2
=2Y^2-2XY
3.(X+1)(X-2)(X-3)
=(X-1+2)(X-2)(X-1-2)
=(X-2)[(X-1)^2-4]
=(X-2)(X^2-2X-3)
=X^3-2X^2-3X-2X^2+4X+6
=X^3-4X^2+X+6以上有过程
4.( 4x)(2x2+3x+1)
5.x(x2+3)+x2(x 3) 3x(x2 x 1)
6.xn+1(xn xn-1+x2+n)
7.(x2 x+1)m(x x2 1)2n(x x2 1)
就找到这几个 你在自己找找吧
=(X+2-1)(X+2)(X+2+1)
=(X+2)([(X+2)^2-1)
=(X+2)^3-(X+2)
=X^3+6X^2+12X+4-X-2
=X^3+6X^2+11X+2
2.(X-Y)平方-(X+Y)(X-Y)
=(X-Y)^2-(X^2-Y^2)
=X^2-2XY+Y^2-X^2+Y^2
=2Y^2-2XY
3.(X+1)(X-2)(X-3)
=(X-1+2)(X-2)(X-1-2)
=(X-2)[(X-1)^2-4]
=(X-2)(X^2-2X-3)
=X^3-2X^2-3X-2X^2+4X+6
=X^3-4X^2+X+6以上有过程
4.( 4x)(2x2+3x+1)
5.x(x2+3)+x2(x 3) 3x(x2 x 1)
6.xn+1(xn xn-1+x2+n)
7.(x2 x+1)m(x x2 1)2n(x x2 1)
就找到这几个 你在自己找找吧