16x的平方=(X-2)的平方
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/13 20:52:42
令x²+x=t原方程化为:t(t-6)=16即:t²-6t-16=0(t+2)(t-8)=0t1=-2,t2=8(1)x²+x=-2,即:x²+x+2=0,无解
(xx-8x+16)/(xx-4x+4)+[1+2/(x-2)][1+2/(x-2)]=2x/(x-2)(x-4)^2/(x-2)^2+[1+2/(x-2)]^2=2x/(x-2)[1-2/(x-2)
http://ci.baidu.com/3j9NHxogvo,验证码:yf8u照下来了
1.无解2.任意实数
(x平方+y平方)平方-y平方=x平方+6所以(x²+y²)²-(x²+y²)-6=0(x²+y²+2)(x²+y
=5x^2-(6x^2-2x-2x^2+6x)=x^2-4x=1/4+2=2.25
由向量x、y构成的平行四边形,两个对角线的平方和等于两条边的平方和的两倍.
3x²+2x²-3x-(-x+5x²)=3x²+2x²-3x+x-5x²=-2x其中x=314时,-2x=-2*314=-6285xy-8x
原式=(x+1)²(x-1)²-4(x+1)²=(x+1)²[(x-1)²-4]=(x+1)²(x-1+2)(x-1-2)=(x+1)&su
-(x+2)的平方+16(x-1)的平方=16(x-1)^2-(x+2)^2=(4x-4)^2-(x+2)^2=(4x-4+x+2)(4x-4-x-2)=(5x-2)(3x-6)
((x+2)/(x^2-2x)-(x-1)/(x^2-4x+4))/((x^2-16)/(x^2+4x))=((x+2)(x-2)-(x-1)x)/((x-2)^2*x)/((x-4)/x)=((x-
(2x+3)平方=x平方-8x+16(2x+3)²=(x-4)²(2x+3)²-(x-4)²=0(2x+3+x-4)(2x+3-x+4)=0(3x-1)(x+7
(x^2-2x)^2-5(x^2-2x)-6=(x^2-2x-6)(x^2-2x+1)=(x^2-2x-6)(x-1)^2=0所以x-1=0或者x^2-2x-6=0x^2-2x-6=0x^2-2x+1
(-2x-1)的平方(2x-1)的平方-16(x+3)的平方(x-3)的平方,=[(-2x-1)(2x-1)]²-16[(x+3)(x-3)]²【逆用“积的乘方”公式】=[(-1-
解(x²-x+2)(x²-2)=x^4-2x²-x³+2x+2x²-4=x^4-x³+2x-4
(3x²-x-2)²=(2x²+4x-8)²-(x²-5x+6)²(3x²-x-2)²=[(2x²+4x-8)
(7+x)的平方+x的平方=(2x)的平方(7+x)^2+x^2=4x^249+14x+2x^2=4x^22x^2-14x-49=0x^2-7x-24.5=0(x-3.5)^2=36.75x-3.5=
x^2-2=0x^2=2原式=x^2-2x+1+x^2/x+2=2-2x+1+2/x+2=(2x+4-2x^2-4x+x+2+2)/x+2=(2x+4-4-4x+x+2+2)/(x+2)=4-x/x+
9+6+1/9-3+1=13又9分之1