最好把过程也写出来,可省略几步1.「(x-y)^2+(x+y)(x-y)」×1/2x2.(3x+2y)(4x-5Y)+(2x)^2×(3y)^3÷(36x^2y)+5xy(1)中x=3,y=-1/3(2)中x=1,y=1

Question

最好把过程也写出来,可省略几步
1.「(x-y)^2+(x+y)(x-y)」×1/2x
2.(3x+2y)(4x-5Y)+(2x)^2×(3y)^3÷(36x^2y)+5xy
(1)中x=3,y=-1/3
(2)中x=1,y=1

Answer 1

1.「(x-y)^2+(x+y)(x-y)」×1/2x =[x^2-2xy+y^2+x^2-y^2]*1/2x=2x^2*1/2x-2xy*1/2x=x-y把X=3,Y=-1/3代入x-y=3-（-1/3）=10/32.(3x+2y)(4x-5Y)+(2x)^2×(3y)^3÷(36x^2y)+5xy=12x^2-15xy+8xy-10y^2+4x^2*27y^3÷(36x^...