计算:"3y/x+y"+"y/y-x"+"2x/x^2-y^2" "a+2/a^2-4a+4"-"1/2a+4"-"a-1/2a^2-8"a^2+a+1-"a^3/a-1" "1/a-2"-"12/a^2-4"一共4题。
来源:学生作业学帮网 编辑:学帮网 时间:2024/05/28 16:53:50
计算:"3y/x+y"+"y/y-x"+"2x/x^2-y^2" "a+2/a^2-4a+4"-"1/2a+4"-"a-1/2a^2-8"
a^2+a+1-"a^3/a-1" "1/a-2"-"12/a^2-4"
一共4题。
"3y/x+y"+"y/y-x"+"2x/x^2-y^2"
=[3y*(x-y)-y(x+y)]/[(x+y)(x-Y)]
=(2xy-4y^2)/[(x-y)(x+y)]
=2xy/(x+y)
a+2/a^2-4a+4"-"1/2a+4"-"a-1/2a^2-8
=(a+2)/(a-2)^2-1/[2(a+2)]-(a-1)/[2(a+2)(a-2)]
=(a+2)/(a-2)^2-(a-2)/[2(a+2)(a-2)]-(a-1)/[2(a+2)(a-2)]
=(a+2)/(a-2)^2-[(2a-3)/[2(a+2)(a-2)]
=[2*(a+2)^2-(2a-3)(a-2)]/[2(a+2)(a-2)^2]
=(15a+2)/2(a-2)^2(a+2)
3.a^2+a+1-"a^3/a-1
=[(a^2+a+1)(a-1)-a^3]/(a-1)
=-1/(a-1)
4.1/a-2"-"12/a^2-4
=1/(a-2)-12/(a+2)(a-2)
=[(a+2)-12]/(a+2)(a-2)
=(a-10)/(a+2)(a-2)
计算:(x+3y)(2x-y)
计算:(2x-3y)(x+y)
计算:(-x-2y) * (3x-y)
计算:(x+y)-3(x-2y).
计算 3x+4y/x-y+3y/y-x-4x/x-y
计算:x+2y/x-y+2x/y-x-3y/x-y
计算:(x+3y)(x-3y)-(x-3y)
计算(x+y)(x+y)^2(-x-y)^3
3x(x-y)+2y(x-y) 计算
计算(-x-y)(y-x)+(-x-y)(x+y),
行列式计算 x y x+y y x+y x x+y x y|x y x+y ||y x+y x ||x+y x y |
计算2/3x-2/x+y(x+y/3x-x-y)/x-y/x
计算n阶段行列式 请帮我解答:计算此3阶段行列式 | x y x+y| | y x+y x | |x+y x y || x y x+y || y x+y x | |x+y x y |
计算(x+y)(x-y)(x+y)3次方(x-y)5次方计算(x+y)×(x-y)×(x+y)3次方×(x-y)5次方
计算:y(x-y)^2+(y-x)^3=?
计算:y×(y/x)^3÷[-(x^2)/y]^-2
计算 x(x-3y)
计算:y-x分之x+y+x-y分之y-y-x分之2x-y