作业帮化简代数式x^2-1 x^2 3x
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/02 03:12:21
原式=（x+1)(x-1)/x(x+2)*x/(x-1)=（x+1)/(x+2)∵x+2-2∴组的解集：-2
原式=(x^2-1)/(x^2+2x)*(x-1)/x=(x-1)^2(x+1)/x^2(x+2),解不等式组：x+2>1,——》x>-1,2(x-1)>-6,——》x>-2,所以,解集为：x>-1,
求代数式x2+4+(12−x)2+9，即(x−0)2+(0−2)2+(12−x)2+(3−0)2的最小值，实际上就是求x轴上一点到（0，-2）以及（12，3）两点的和的最小值，而两点间的距离是线段最短
再答：望采纳，谢谢
原式=(x²-2)/(x+1)(x-1)÷[(x²-1-2x+1)/(x+1)=(x²-2)/(x+1)(x-1)×(x+1)/(x²-2)=1/(x-1)
[1/(x-1-1/(x+1）]÷x/(x^2-1)=[(x+1)-(x-1)]/(x+1)(x-1)*[(x+1)(x-1)/x]=[2/(x+1)(x-1)]*[(x+1)(x-1)/x]=2/x
原式=2x²+x-kx²+3x²-x+1=(5-k)x²+1是负数则(5-k)x²+1
2x^5-5x^4-x^3+x^2-6x/(x^2+1)=2x^5-5x^4-x^3+x^2-6x/3x=2x^5-5x^4-x^3+x^2-2=2x^3(x^2-3x+1)+x^4-3x^3+x^2
3x／（4x+1）-2x／（5x-3）=3x(5x-3)/(4x+1)(5x-3)-2x(4x+1)/(4x+1)(5x-3)=(15x^2-9x-8x^2-2x)/(20x^2-7x-3)=(7x^
1-7x＜3,-7x-2/7x+1>5/7;-3x＞0x
x2−1x2+2x÷x−1x=x2−1x2+2x•xx−1=(x −1)(x+1)x(x +2)•xx−1=x+1x+2，不等式组x+2＜1①2(x−1)＞−6②，解不等式①，得x
1/x-1+1/x+1+2x/x²+1+4x³/x^4+1=(x+1+x-1)/(x-1)(x+1)+2x/(x²+1)+4x³/(x^4+1)=2x/(x&#
1-7x＜3-5x2x>-2x>-1x+1>0-3x>0x
(2x²+x)-[kx²-(x²-x+1)]=2x²+x-(kx²-x²+x-1)=2x²+x-kx²+x²-
√[x＋2√﹙x－1﹚]－√[x－2√﹙x－1﹚]＝√[﹙x－1﹚＋2√﹙x－1﹚＋1]－√[﹙x－1﹚－2√﹙x－1﹚＋1]＝√[√﹙x－1﹚＋1]²－√[﹙x－1﹚－1]²＝|
∵x²-2x=2∴x²-2x+1=3即（x-1）²=3原式=（x-1)²+(x+3)(x-3)+(x-3)(x-1)=（x-1）²+(x-3)(x+3
解3(x-1)-(x-5)=3x-3-x+5=(3x-x)+(5-3)=2x+22(x²-y²)-3(x²-2y²)=(2x²-3x²)+(