160+x=3x的解
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/18 16:31:08
(2x-3)(x-三分之一)=3x的平方-(x+1)(x-1)2x²-3x-2/3x+1=3x²-x²+111/3x=0x=0
x(x-3)=6-2xx²-3x=6-2xx²-x-6=0(x-3)(x+2)=0x1=3x2=-2
设X²+3X为Y;Y-8=20/Y;Y²-8Y-20=0;(Y-10)(Y+2)=0;Y=10或-2;所以:1:X²+3X=10,X=2或-5;2:X²+3X=
x(x^2-2)+2x^2(x+3)-3x(5x-7)=x(3x^2-9x+17)+2=>x^3-2x+2x^3+6x^2-15x^2+21x=3x^3-9x^2+17x+2=>2x=2x=1
x(2x-5)>2x^2-3x-42x^2-5x>2x^2-3x-4-2x>-4x(x+5)(x-5)-2x^2-2x-3+8x>x^2-25-2x^2-6x-3>x^2-27-6x>-24x
x²-3x+1=0x²+3x-1=0x1=(-3+√13)/2或x2=(-3-√13)/2
(X-3)平方-(X+3)*(X-3)=(X+1)*(X+2)-(X-1)*(X+4)x^2-6x+9-x^2+9=x^2+3x+2-x^2-3x+4-6x+18=66x=18-66x=12x=2
X/(X2-3X+1)=1/(X-3+1/X)=1所以X+1/X=4X2/(X4-9X2+1)=1/(X2-9+1/X2)=1/[(X+1/X)2-11]=1/[16-11]=1/5X2表示X的平方X
x(x+3)-x(1-2x)=1+3x²x²+3x-x+2x²=1+3x²x²+3x-x+2x²-3x²=12x=1x=2分之1
设x1=4-√3,x2=4+√3,是方程X^2-8X+13=0的两根所以X1^2-8X1+15=2X^4-6X^3-2X^2+18X+23=(X+1)^2*(X^2-8X+13)+10=10所以原式=
x【x+1】的平方-x【x的平方-3】-2【x+1】【x-1】=20x³+2x²+x-x³+3x-2x²+2=204x+2=204x=18x=4.5
(x+1)/(x+2)+(x+6)/(x+7)=(x+2)/(x+3)+(x+5)/(x+6)(x+2-1)/(x+2)+(x+7-1)/(x+7)=(x+3-1)/(x+3)+(x+6-1)/(x+
分母x²+x+2=(x+1/2)²+7/4>0所以分子x²-3x-10≤0(x+2)(x-5)≤0-2≤x≤5
X²-3X=0X(X-3)=0X=0或X=3
X=(ac-bd)/2(a-b)
不知道你^这个符号什么意思暂且当成平方做吧x^2+4x+3=(x+1)(x+3)(2x-x)^2=x^2x^2+x=x(x+1)x^2+x-6=(x+3)(x-2)约分:得x/(x-2)再问:题目炒错