第一题:(3xy^2)^2+(-xy^3)×(-4xy) 第二题:(2x^3y)2×(-2xy)+(-2x^3y)^3×
数学题 化简,要过程第一题2xy-{5x-3[xy-三分之一x(y+1)]-4xy}第二题二分之一x-(2x-三分之二y
(-3x^y+2xy)-( )=4x^+xy
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2
已知x-y=4xy,则2x+3xy-2yx-2xy-y
先化简,再求值 ⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1
x^2-xy-6y^2+3xy+y+2
5xy^2-[3xy^2-(4xy^2-2x^y)]+x^2y-xy^2如何化简
计算3xy[2xy-x(y-2)+x-1]
计算:3xy[2xy-x(y-2)+x]
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]
xy(xy+1)+(xy+3)-2(x+y+2分之一)-(x+y-1)的平方