2xy-{5x-3[xy-1/3x(y+1)]-4xy} 去掉括号,并合并.
2xy-{5x-3[xy-1/3x(y+1)]-4xy} 去掉括号,并合并.
3(x的平方-2xy)-2(-3xy+y的平方),去括号并合并同类项
代数式去括号并合拼同类项“3x²y+xy²-【2xy²-4x²+(x²
(2xy-y)-(-y+xy)去括号并合并同类项
化简并求值 xy-2{xy-[3x²y-(xy²+0.5xy)]+4x²y},其中x=1,
先化简,再求值 ⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1
5x^2y/-1/2xy*3xy^2
共5题 去括号,并合并同类项(1.) -3(2x^2-xy)+4(x^2+xy-6)(2)a+[2a-2-(4-2a)]
计算3xy[2xy-x(y-2)+x-1]
去括号:1/2(2X²Y-3XY²+4XY-X²Y²)=?
已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y=
x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2