xy^2-5x^2y+1/2xy^2+2/3x^y

来源：学生作业帮编辑：拍题作业网作业帮分类：数学作业时间：2024/05/29 17:52:27

原式=xy²+1/2xy²-5x²y+2/3x²y
=3/2xy²-13/3x²y
再问： 23a^2bc+10abc^2-15abc^2+2a^2bc+abc^
再答：原式=23a^2bc+2a^2bc+10abc^2+abc^2-15abc^2 =25a^2bc-4abc^2
再问：先化简再求值by^2-12y-3+10y-2-by^2,其中y=-5/6
再答：原式=-12y+10y-3-2 =-2y-5 y=-5/6 原式=-2×（-5/6）-5 =5/3-15/3 =-10/3
再问： 4a^4-2ab^3+6ab^3-3a^4,其中a=3,b=-2
再答：原式=a^4+4ab^3 =a(a^3+4b^3) a=3,b=-2 原式=3×（27-32）=-15 另外请不要追问了，题目的处理请随意！

5x^2y/-1/2xy*3xy^2 （xy-x^2)乘以(xy)/(x-y) 计算3xy[2xy-x(y-2)+x-1] (x+y-2xy)(x+y-2)+(1-xy)² 已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y= (x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y) 计算：(5-xy/x^3-x^2y)/(1-5/xy)^2*(y-x)^3 x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2 xy(xy+1)+(xy+3)-2(x+y+2分之一）-(x+y-1)的平方 (-3分之1xy)的平方×[xy(2x-y)-2x(xy-y的平方)] 1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y) （x^2+xy/x-y)/（xy/x-y)计算