孩子在家表现评语:1x+2y+3x+……100y=?

1x+2y+3x+……100y=? (x-y)^2×(y-x)^3=??? 已知X+Y=-4，求1/2（X+Y)+4(X-Y)-3(X-Y)-3/2(X+Y)-X+Y x*(1+y+y^2+y^3……y^n) 2(x+y)+3(x-y)=9(1) (x+y)+6(x-y)=9(2) 已知(X +2x+3)(3y +2y+1)= ,求x+y的值？ x-y=1,x^2-y^2+3x-5y的值 1/4(x+y)+1/2(x+y)*(x+y)>=x*根号y+y*根号x 方程组{5（x-y)=3(x+y)-2 (1) (x+y)*2=3(x-y)-4 求x和y的值 规定运算&,使得X&Y=X*X-Y*Y/X*X+Y*Y,则求(-1/2)&(-1/3)