整式的除法10.计算(1)(2x^2)^3-6x^3(x^3+2x^2+x)(2)(x+y+z)(x+y-z)(3)(x+y)^2-(x-y)^2÷(2xy)(4)a^2(a+1)^2-2(a^2-2a+4)11.求下列各式的值(1)1/2x+(-3/2x+1/3y^2)-(2x-2/3y^2),其中x=-1/3,y=2/3(2)(xy+2)(xy-2)-2x^2y^2+4÷(x

Question

整式的除法10.计算 (1) (2x^2)^3-6x^3(x^3+2x^2+x) (2) (x+y+z)(x+y-z) (3) 【(x+y)^2-(x-y)^2】÷(2xy) (4) a^2(a+1)^2-2(a^2-2a+4) 11.求下列各式的值 (1) 1/2x+(-3/2x+1/3y^2)-(2x-2/3y^2),其中x=-1/3,y=2/3 (2) 【(xy+2)(xy-2)-2x^2y^2+4】÷(xy),其中x=10,y=-1/25 (3) x(x+2y)-(x+1)^2+2x,其中x=1/25,y=-25

Answer 1

(1) (2x^2)^3-6x^3(x^3+2x^2+x) =8X^6-6X^6-12X^5-6X^4 =2X^6-12X^5-6X^4 (2) (x+y+z)(x+y-z) =(x+y)^2-Z^2 =X^2+2XY+Y^2-Z^2 (3) 【(x+y)^2-(x-y)^2】÷(2xy) =(X^2+2XY+Y^2-X^2+2XY-Y^2)÷(2xy) =4XY÷(2xy) =2 (4) a^2(a+1)^2-2(a^2-2a+4) =a^2(a^2+2a+1)-2a^2+4a-8 =a^4+2a^3+a^2-2a^2+4a-8 =a^4+2a^3-a^2+4a-8 哎 累死了， = = 下面的哈。