(-2/3X³y+4x²y²-1/2xy²)/(-xy/4) 急
(-2/3X³y+4x²y²-1/2xy²)/(-xy/4) 急
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
-2y³+(3xy²-x²y)-2(xy²-y³)
计算:(-7x²y)(2x²y-3xy³+xy)
(2x²y-3xy²)-3(x²y-2xy²)+2(x²y-4xy
去括号:1/2(2X²Y-3XY²+4XY-X²Y²)=?
﹙4x³y²-2x⁴y²-½xy)÷(-1/2xy) (^人^)
2xy-1/2(4xy-8x²y²)+2(3xy-5x²y²),其中x=3/2,
已知x-2y=3,x²-2xy+4y²=11,求下列各值; (1)xy (2)x²-2xy
化简3/(x²+2xy+y²)-4/(x²-2xy+y²)+5/(x²