(-2x^4y^5)^3 (-3x^3y^)^/(-12x^10y^10)

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(-2x^4y^5)^3 (-3x^3y^)^/(-12x^10y^10)
a^3*a^3+(-2a^3)^+(-a^)^3
前两题要有过程!
若5^k-3=1则K-^=什么

(-2x^4y^5)^3 (-3x^3y^2)^2/(-12x^10y^10)
=-8x^12y^15*9x^6y^4/(-12x^10y^10)
=-72x^18y^19/(-12x^10y^10)
=6x^8y^9
a^3*a^3+(-2a^3)^+(-a^)^3
=a^6+4a^6-a^6
=4a^6
5^k-3=1
log5^k-3=log1
(k-3)log5=0
k-3=0
k=3
5^k-3=1
5^k-3=5^0
k-3=0
k=3

化简(x+y)-(2x+y/2)-(3x+y/6)-(4x+y/12)-(5x+y/20)-……-(10x+y/90) 化简求值:(x+y)-(2x+1/2y)-(3x+1/6y)-(4x+1/12y)-(5x+1/20y)-.(10x+1 (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai （x+2)(x+3) (x-4)(x+1) (y+4)(y-2) (y-5)(y-3) 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27 计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2) x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8 数学(x-y)^5*(y-x)^3*(x-y)^2 [-(x-y)^2/xy]^-4*(y^2-xy/x)^3*(x^4/y^10)÷(xy-y^2/x)^-5=-y(y- 已知X,Y,满足(X+3Y)(X-3Y)=-10(Y^2-6/5)和2X(Y-1)+4(1/2X-1)=0 解方程组：（0.2x+0.1y）/2- （4x-y）/10=（x-y）/5+ (3x+0.5y)/30 (3x+2y-1 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)