x减5 6等于1
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解x³-2x+1=0x³-x²+x²-x-x+1=0(x³-x²)+(x²-x)-(x-1)=0x²(x-1)+x(x-
(x-1/x)²=x²-2+1/x²=(x+1/x)²-4=5∴x-1/x=±√5∴x²-1/x²=(x+1/x)(x-1/x)=±3√5
X等于18的哈
X-X/2=15方程两边同乘以2得:2X-X=30X=30如果原题X-2是整体做为分母的话:X/(X-2)=15方程两边同乘以X-2得:X=15(X-2)X=15X-3030=15X-X14X=30X
(1-x)/(1+x)=t,所以t+tx=1-x,即:tx+x=1-t,所以x(1+t)=1-t,x=(1-t)/(1+t).
x-y=-2①x+y=1②把①+②得x-y+x+y=-2+12x=-1x=-1/2把x=-1/2代入②得(-1/2)+y=1y=1-(-1/2)=3/2∴x=-1/2,y=3/2即x=-0.5,y=1
x^2-x-1=0x^2-x+0.25-1.25=0(x-0.5)^2=1.25x-0.5=±0.5√5x=0.5(1±√5)
x+1/x=√13两边平方x²+2+1/x²=13x²+1/x²=11(x-1/x)²=x²-2+1/x²=11-2=9所以x-1
1/3再问:过程?谢再答:不对,算错了,你等等哈再问:再答:再答:应该是这样的再问:
再问:eko再答:лл
(X加3)(x减1)等于5x²+2x-3=5;x²+2x-8=0;(x+4)(x-2)=0;x=-4或x=2;很高兴为您解答,skyhunter002为您答疑解惑如果本题有什么不明
1-1/﹙1-x﹚=1-1/x1/﹙1-x﹚=1/x1-x=xx=½经检验x=½是解
x^2-y^2=(x+y)*(x-y)=-1*(-3)=3
x-1/x=1x^2+1/x^2=(x-1/x)^2+2=1+2=3x^3-1/x^3=(x-1/x)(x^2+1+1/x^2)=1*(3+1)=4不懂可追问,有帮助请采纳,谢谢!再问:x^3-1/x
9x-x=8x
解x=96x+5x-1=11x-1=11×9-1=99-1=98
x²-4x=1x²-4x+4-4=1(x-2)²=4+1(x-2)²=5x-2=±√5x=±√5+2再问:虾米?写下来?谢谢再答:这个很简单,
9.5x减x等于8.5x
(x-3)/2-(3x+1)/4=12(x-3)-(3x+1)=42x-6-3x-1=4-x=11x=-11