2^x=b,2^y=ab,2^z=a^2b,试说明2y=x+2

(y-x)/(x+z-2y)(x+y-2z)+(z-y)(x-y)/(x+y-2z)(y+z-2x)+(x-z)(y-z)/(y+z-2x)(x+z-2y)的值我已经做到这了：设(X-Y)为a （Z-Y)为b (Z-X)为c则原题= (-a*-c)/-(a+b)(b+c)+ab/-(c+b)(a+c)+c*-b/(-a+c)(a+b) (a-b)+(-2a-b)=?（x+y-z）+（x-y+z）-（x-y-z）=? 初一数学题与代数式有关化简（a+b)(a^2-3ab=9b^2)-(a-3b)(a^2+3ab+9b^2)（x+y)^2(y+z-x)(z+x-y)+(x-y)^2(x+y+z)(x+y-z)已知z^2=x^2+y^2,化简（x+y+z)(x-y+z)(-x+y+z)(x+y-z)已知x(x-1)-(x^2-y)=-2求x^2+y^2/2-xy不需要完整的过程有2步 大哥大姐 解几道代数题吧!(1)若x+y=z,且x≠y,求x/(x-z)+y/(y-z)的值(2)若ab=1,求a/(a+1)+b/(b+1)的值 已知：xy/(x+y)=a,xz/(x+z)=b,yz/(y+z)=c,且abc不等于0,求证:x=2abc/(bc+ac-ab) 已知：xy/(x+y)=a,xz/(x+z)=b,yz/(y+z)=c,且abc不等于0,求证：x=2abc/(bc+ac-ab) x+y+z=12 x-y+z=2 x-z+y+a=90 x+y+a+z=100,求x y z a a²-b²-4ab-4c²=a²-（）()+x²-xy+2y²=2x²+xy=3y²(-x+y+z)(x+y-z)=[y-()][y+()] 1.[(a+b)²-3ab][(a-b)²+3ab]2.(x+y+z)(x+y-z)-(x-y+z)(x+y-z)3.已知x=2,y=-4时,代数式ax³+1/2by+5=1997,当x=-4,y=-2时,求代数式3ax-24by³+4986的值. 初一因式分解练习题,谁好心帮我解下表示平方1.2X~-3XY-X2.(X+Y)~(X+Y)(X-Y)(X+Y)(Y+Z)3.3X(a+2b)~-6XY(a+2b)4.a(x-y)-b(X-Y)-C(Y-X)5.(b-a)~-2a+2b6.(x-y)~-m(y-x)+y-x7.x(x-y)(a-b)-y(y-x)(b-a)8.已知a+b=13,ab=40,求 b+ab~的值 1.已经线段AB的长为8CM.点C在AB上.且AC=√ AB*√ BC,则AC的长为2.已知X/a-b=y/b-c=z/c-a(a,b,c互不相等),则x+y+z的值为3.若x/2=y/7=z/5,且A=y/x+y+z,B=x+zy,C=x+y-z/x.用＜号将A,B,C连接起来4.已经Z≠0,若4x-7y-5z=0,x-2y-z 已知二次方程(ab-2b)x²+2(b-a)x+2a-ab=0有两个相等的实数根,则2/a+2/b=?如题,今晚之前啊( ⊙ o ⊙ )还有一道。已知x,y,z满足x+y+2z=1,x²+y²+6z+1.5=0,求x,y,z的值 (1)(x+y)^2-(x+y)^3(2)(x-y)-(x-y)^3(3)(x-y)^2-(y-x)^3(4)2(x-y)-3(y-x)^2(5)4ab(a=b)^2-6a^2b(a+b)(6)(x+y)^2(x-y)+(x+y)(x-y)^2(7)2a(a-3)^2-6a^2(3-a)+8a(a-3)(8)24xy^2z^2(x+y-z)-32xyz(z-x-y)^2+8xy(z-x-y)(9)(a-b)(b-a)^n(b-a)^2n-1 [两解）（10）2^2=3,2^b (z-x)2-4(x-y)(y-z)=0 求证x-2y+z=0 （提示：设x-y=a,y-z=b,则x-z=a+b）写错了是(z-x)的平凡-4(x-y)(y-z)=0 求证x-2y+z=0 （提示：设x-y=a，y-z=b，则x-z=a+b）那个平凡老是打不出来！sorry 已知：X+Y+Z=a,X^2+Y^2+Z^2=b^2,X^3+Y^3+Z^3-3XYZ=c^3,求证3ab^2=a^3+2c^3 (1)已知:x(1/y+1/z)+y(1/x+1/z)+z(1/x+1/y)+3=0,且1/x+1/y+1/z不等于0,求x+y+z的值.(2)设a>0,b>0,且满足根号a(根号a+根号b)=3根号b(根号a+5根号b),试探求a-b+根号ab/2a+3b+根号ab的值. (a)因式分解行列式 |bc a a^2| |ca b b^2| |ab c c^2|(a)因式分解行列式,第一行bc a a^2,第二行ca b b^2,第三行ab c c^2|bc a a^2||ca b b^2||ab c c^2|(b)求以下方程组的通解:2x+y+z=0x+2y-4z=0(c)利用(b)的通解,2x+y+z=0x+2y-4z x,y,z为实数,x-y+2z=0,则xz/y平方的最大值为?2 若a大于0,y大于0,且a+b=1,则ab+1/ab的最小值为?