计算(x∧-3y∧-4)∧-1×(x∧2y∧-1)∧2
计算 (2y-3)(y+4) (-5x+2)∧2 (2x-3y)(2x+3y) (2x-5)(x-2)-(-4+3x)(
dx/dy=x/y+[cos(x/y)]∧2,y(0)=1
计算:[(-3x²y∧4)²·x²-2x(3x²y²)³·1
已知x,y是实数,且(x+y-1)²与根号(2x-y+4)互为相反数,求实数y∧x的倒数大相反数.
因式分解:16(x+ y)∧2 +121(x-y)∧2-88(x +y)(x-y)
因式分解25(x-y)∧2+10(y-x)+1 3x∧3-12x∧2y+12xy∧2
3(x-y)²×[-4/15(y-x)³][-3/2(x-y)∧4]
计算:1/(2x) - 1/(x+y)((x+y)/(2x) - x - y)
先化简,再求值(x+2y)∧2-(x+y)(3x-y)-5y∧2,其中x+-2,y=1/2
计算(1)x/x+y-x/x-y (2)a+2+4/a+2 (3)x^2-y^2/xy÷(x+y)
已知1+2X∧3-3X∧2=3Y 求X=F(Y)
计算:(3x-4y)-[-(2y+x)+(x-3y)]-6x