儿玉菜菜子所有番号:(1÷2)X-[2X-(2÷3)Y×Y]+[-(3÷2)X+(1÷3)Y×Y]=??
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-3x+y^2
(1÷2)X-[2X-(2÷3)Y×Y]+[-(3÷2)X+(1÷3)Y×Y]=??
(x-y)^3*(x-y)^2*(y-x)
3X(X-Y)+2Y(X-Y)
1/2x — x+y 乘以 ( x+y/2x — x-y )
(x+y)2-4(x+y-1)
(x-y)^2×(y-x)^3=???
已知|Y/X|=3 求 [(X^2+2XY+Y^2)/X^2Y^2][(x-y)/(x-2y)]
已知x≥0,y≥0,求证:1/2(x+y)² +1/4(x+y) ≥x√y+y√x
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如果x和y互为倒数.求:(1).x*x*x+2y*y*x*x+x*y*y*y (2).x*x*x-x*y+y*y*y (要有过程)