化简下列各式(1)5X4+3X2Y-10-3X2Y+X4-1 (2)P2+3pq+6-8p2+pq (3)(7y-3z)
4x2y-{x2y-「3xy2 – 1/ 2(4x2y-8xy2)+x2y」}-5xy2
已知x-y=1,求代数式x4-xy3-x3y-3x2y+3xy2+y4.
当x-y=1时,那么x4-xy3-x3y-3x2y+3xy2+y4的值是( )
化简求值:2(x2y+xy)-3(x2y-xy)-4x2y,其中x=-1,y=1.
分解因式:①x2y2-5x2y-6x2 ②(p2+q2)2-4p2q2③(a-b)4-3(a-b)2-10 &
(1-20%)y-18=(3\4x2y-12)x4\15 y等于几?3分钟之内解答出
先化简后求值:4x2y-[6xy-3(4xy-2)-x2y]+1,其中x=2,y=-12
化简(急!化简下列各式:(1)5x^4+3x^2y-10-3x^2y+4x-1(2)p^2+3pq+6-8p^2+pq(
已知x,y,z满足(1)已知|x-2|+(y+3)2=0(2)z是最大的负整数化简求值2(x2y+xyz)-3(x2y-
化简求值①化简:4ab+8-2b2-9ab-6②先化简,再求值:已知3x2y-[2x2y-3(2xy-x2y)-xy],
已知A=x3+3x2y-5xy2+6y3-1,B=y3+2xy2+x2y-2x3+2,C=x3-4x2y+3xy2-7y
2(x2y+xy)-3(x2y+xy)-4x2y其中x=-2,y=12