(x+5)(x+6)(x+10)(x+12)-2x^2 因式分解

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(x+5)(x+6)(x+10)(x+12)-2x^2 因式分解
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(x+5)(x+6)(x+10)(x+12)-2x^2 因式分解
(x+5)(x+6)(x+10)(x+12)-2x^2 因式分解

(x+5)(x+6)(x+10)(x+12)-2x^2 因式分解
( x + 5 )( x + 6 )( x + 10 )( x + 12 ) - 2x"
= ( x + 12 )( x + 5 )( x + 6 )( x + 10 ) - 2x"
= [ ( x" + 60 ) + 17x ][ ( x" + 60 ) + 16x ] - 2x"
= ( x" + 60 )" + ( 33x )( x" + 60 ) + 272x" - 2x"
下面开始分解
= ( x" + 60 )" + ( 18x )( x" + 60 ) + ( 15x )( x" + 60 ) + 270x"
= ( x" + 60 )( x" + 60 + 18x ) + ( 15x )( x" + 60 + 18 )
= ( x" + 15x + 60 )( x" + 18x + 60 )
分成两个因式,可能也行了,
在实数范围,还能继续分解
= ( x" + 15x + 60 )( x" + 18x + 9" - 81 + 60 )
= ( x" + 15x + 60 )[ ( x + 9 )" - 21 ]
= ( x" + 15x + 60 )( x + 9 + √21 )( x + 9 - √21 )
在复数范围,就能继续分成四个因式
= [ x" + 15x + (15/2)" - 225/4 + 240/4 ]( x + 9 + √21 )( x + 9 - √21 )
= [ ( x + 15/2 )" + 15/4 ]( x + 9 + √21 )( x + 9 - √21 )
= { x + 15/2 - [ (√15)/2 ]i }{ x + 15/2 + [ (√15)/2 ]i }( x + 9 + √21 )( x + 9 - √21 )

*-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X || 填九宫格帮帮忙.x x 6 x x 7 x x 98 x x x 3 x 1 x x 9 x x 6 x 5 x 3 x x x 3 x x x x 1 8x x x 9 x 1 x x x2 1 x x x x 6 x x x 6 x 7 x 3 x x 1 x x 9 x 2 x x x 47 x x 8 x x 5 x x 1+x+x^2+x^3+x^4+x^5+x^6+x^7+x^8+x^9+x^10+x^11+x^12=97.8x+x^2+x^3+x^4+x^5+x^6+x^7+x^8+x^9+x^10+x^11+x^12=97.8 好多年没有用过过数学公式了 想不起来怎么算了 想知道 X值是多少 已知x=2π+1求 |x-1|+|x-2|+|x-3|+|x-4|+|x-5|+|x-6|+|x-7|+|x-8|+|x-9|+|x-10| 已知x=2π+1.求(X-1)+(X-2)+(X-3)+(X-4)+(X-5)+(X-6)+(X-7)+(X-8)+(X-9)+(X-10) 1+x+x^2+x^3+x^4+x^5+x^6+x^7+x^8+x^9+x^10+x^11=17.7这个方程怎么样求解? 计算（x*x+4x+5）/（x+2）-（x*x+6x+10）/（x+3）+1 求一个数独答案X X X 9 X X X 8 2 X 6 3 X X 1 4 X 99 X 8 X X X X X XX X X 6 7 X 3 X XX 4 6 X 5 X 2 9 XX X 7 X 2 3 X X XX X X X X X 7 X 17 X 4 3 X X 6 2 X6 3 X X X 7 X X X x^6-x^5+x^4-x^2+x-1 1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550必须用解方程 xy²/(x²y-y) × x²/(x²+x)=(x²-3x)/(x²-5x) × 2x-10/(x²-6x+9)=化简求植x²-1/(x²-x-2)除以x/2x-4,其中x=1/2[x-x/(x+1)]除以[x/(2x-4)] ,其中x=√2+1 难倒爱因斯坦的九宫格X 7 X | X 8 1 | X X X |X X X | X 4 X | 7 5 9 |X X 5 | 7 X 9 | X 1 4 |5 X X | X X 8 | 3 9 X |3 9 6 | 4 X 7 | X X 2 |X 8 7 | 9 X X | X X X |4 X X | 6 X 5 | X X X | X X 4 | X X 1 |2 X X | X X X | X X X | X 3 X | X X X |X 6 1/(x+1)(x+2)+1/(x+3)(x+4)+1/(x+5)(x+6)+1/(x+7)(x+8)+1/(x+9)(x+10)怎么解 1x()+2x()+3x()+4x()+5x()+6x()+7x()+8x()加9x()+10x()=1980 1X?+2X?+3X?+4X?+5X?+6X?+7X?+8X?+9X?+10X?=1980求?是多少 |X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10|的最小值谢谢了,大神帮忙啊如题 |x-1|+|x-2|+|x-3|+|x-4|+|x-5|+|x-6|+|x-7|+|x-8|+|x-9|+|x-10|的最小值 这类题该怎入手 如下9*9宫图如何填x x x 1 x x x 2 9x x 5 x x x x x 4x 6 8 x x x x x xx x x 7 x x 5 x xx 2 x x 6 x x 8 xx x 3 x x 9 x x xx x x x 5 x 1 6 x 4 x x x 3 x x x x 7 x x x x 2 x x x