x-80=3(x-280)的解-搜答案-智慧作业帮

(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

方程x(x-3)=6-2x的解

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

1、56-8X=11+X8X+X=56-119X=45X=52、3X-2=X+1+6X3X-2=7X+17X-3X=-2-14X=-3X=-3/43、7+X=2X+20-14X7+X=20-12XX+

(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

1:x²+X-2分之3=X-1分之X-X+2分之XX²+X-(X-1分之X)+X-2分之X=0X²+2X-(X-1分之X)-2分之X=0∵X-1≠0所以（X-1)(X&#

intf(floatx)返回值,错了.

设y=x²+3x∴y+8/y=-6y²+6y+8=0∴(y+2)(y+4)=0∴y=-2或y=-4∴x²+3x=-2x²+3x=-4x²+3x+2=0

x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6)x/(x-2)=2x/(x-3)+(1-x)/(x-2)(x-3)x(x-3)/(x-2)(x-3)=2x(x-2)/(x-2)(x-3)

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

3x^2-x(2x+3)=x(x-5)-2(2x+3)3x^2-2x^2-3x=x^2-5x-4x-66x=-6x=-1

（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+

(x+x)+(x-x)+(xx)+(x/x)=1002x+0+x²+1=100x²+2x+1=100（x+1）²=10²x+1=10或x+1=-10x=9或x=

3^(x+2)-3^(2-x)=809*3^x-9/3^x-80=09*(3^x)^2-80*(3^x)-9=0(9*3^x+1)*(3^x-9)=03^x-9=03^x=9x=2

x+3x=80解方程