4x加2=50
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原方程为:x+x\2+1-x+x\4+3=x+x\6+5-x+x\8+7整理得:3x\4+4=7x\24+12两边同时乘以24,得18x+96=3x+288,x=12.8
[(x-4)/(x^2-1)]÷[(x^2-3x-4)/(x^2+2x+1)]+1/(x-1)=[(x-4)/(x+1)(x-1)]÷[(x-4)(x+1)/(x+1)^2]+1/(x-1)=[(x-
原式=(x+2y)^2-(x+2y)+1/4=0则x+2y=1/2
x²+4x+8=2x+11x²+2x=3x²+2x+1=3+1=4(x+1)²=(±2)²x+1=±x=-1±2x=-3,x=1
(x+1)(x+2)(x+3)(x+4)+1=[(x+1)(x+4)][(x+2)(x+3)]+1=(x^2+5x+4)(x^2+5x+6)+1把x^2+5x看做A,所以原式化成:(A+4)(A+6)
(50加70)x=(60加70)乘(x加2)120x=130(x+2)120x=130x+260-10x=260x=-26
x+4x=205x=20x=20÷5x=4
由于√x²-4与√4-x²都要成立则x²-4=0所以x=2或者-2由于1/x-2成立则x≠2所以x=-2y=1/(-2-2)=-1/4所以3x+4y=3*(-2)+4*(
[(x+2)/(x-2)-(x-4)/(x^2-4x+4)]÷(x^2-1)/(x^2+x)=[(x^2-4)/(x-2)^2-(x-4)/(x-2)^2]*x(x+1)/(x-1)(x+1)=(x^
x^2+4x-2=0x=-2±√6x=-2+√6时(4x)^2+48x+2000=16*(-2+√6)^2+48*(-2+√6)+2000=-16√6+2064x=-2-√6时(4x)^2+48x+2
x=-20/7y=-16/21再问:3x-4等于5,2x加3y等于负8第一题第二题3x加2x=5x加2,2(3x加2y)等于2x加8再答:加题就要加分数,我很忙的,不然太吃亏了再问:你看错了把,这是2
X+(X+2)+X/4=742X+X/4=728X+x=2889X=288X=32
x={(根号5)-1}/2是方程x^2+x-1=0的根,2x^5-3x^4+4x^3+x^2+1=2x^3(x^2+x-1)-5x^4+6x^3+x^2+1=-5x^4+6x^3+x^2+1=-5x^
x^2+16y^2+4x+4y+5=0x^2+4x+4+4y^2+4y+1=0(x+2)^2+(2y+1)^2=0因为x^2>=0所以x+2=02y+1=0所以x=-2y=-1/2
2x+9=4x+24x-2x=9-22x=7x=7/2
y=x²+4x+4-4+1=(x+2)²-3(x+2)²≥0(x+2)²-3≥-3所以最小值是-3
设x-2为A,将A代入式子得,A分之x+3A分之4x=2,然后根据正常的解方程步骤算出结果
x²+4x+8=2x+11x²+2x-3=0x=﹙-2±√16﹚/2=-1±2x=1,x=-3x(x-4)=2-8xx²-4x+8x-2=0x²+4x-2=0x
1+1/(x+2)+1+1/(x+3)=1+1/(x+4)+1+1/(x+1)1/(x+2)+1/(x+3)=1/(x+4)+1/(x+1)1/(x+3)-1/(x+4)=1/(x+1)-1/(x+2
6x