a^2b^2c-abc+1/4c;a^2(x-y)+b^2(y-x);
a^2b^2c-abc+1/4c;a^2(x-y)+b^2(y-x);
①-12abc(3a+4b-2c)②(x-3y)(x-1/2y)③(x+2y)^2(x-2y)^2④(a-2b+c)(a
A.A+(4X+3Y)B.A+(4X+6Y) C.A+2(
分解因式1.x^2+y^2+2x+6y+10 2.(1-y)^3+4(y-x) 3.(a-c)^2-4(a-b)(b-c
已知a、b互为相反数,c、d互为倒数,X=4(a-2)-(a-3b),y=c²d-(cd+c-1),解x+y/
计算:(1)(a-2b+c)(a+2b-c)-(a+2b+c)2;(2)(x+y)4(x-y)4;(3)(a+b+c)(
已知集合A={x丨-1≤x≤4},B={y丨y=8-2^x,x∈A},C={y丨y=2x+a,x∈A},若满足CX
先去括号,再合并同类项(1)(x-2y)-(y-2x)+(-3x+y) (2)(a-b+c)-(b-c+a)
因式分解2x²y-xy-3y (-a+b)+c²(a-b)
解方程组2x/a+3y/b-4z/c=1,4x/a+2y/b-3z/c=3,3x/a+4y/b-2z/c=5
解二元一次方程(1)a-b+c=4 a+b+c=3 2a+b+c=3(2)x-y-z=5 y-z-x=1 z-x-y=1
已知x=1/y,则(x-1/x)(y-1/y)等于 A、2x² B、2y² C、x²+y&