3a-3b/10ab25a^b3/a^-b^= x^-4y^/x^+2xy+y^/x+2y/2x^+2xy(3a-3b)/(10ab)(25a^b3)/(a^-b^)= (x^-4y^)/(x^+2xy+y^)/(x+2y)/(2x^+2xy)=

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3a-3b/10ab*25a^b3/a^-b^= x^-4y^/x^+2xy+y^/x+2y/2x^+2xy(3a-3b)/(10ab)*(25a^b3)/(a^-b^)= (x^-4y^)/(x^+2xy+y^)/(x+2y)/(2x^+2xy)=
3a-3b/10ab*25a^b3/a^-b^= x^-4y^/x^+2xy+y^/x+2y/2x^+2xy
(3a-3b)/(10ab)*(25a^b3)/(a^-b^)=
(x^-4y^)/(x^+2xy+y^)/(x+2y)/(2x^+2xy)=

3a-3b/10ab*25a^b3/a^-b^= x^-4y^/x^+2xy+y^/x+2y/2x^+2xy(3a-3b)/(10ab)*(25a^b3)/(a^-b^)= (x^-4y^)/(x^+2xy+y^)/(x+2y)/(2x^+2xy)=
1.
=3(a-b)/(10ab)*(25a^2 b^3)/((a+b)(a-b))
=15/2*(a b^2)/(a+b)
2.
=(x+2y)(x-2y)/(x+y)^2*2x(x+y)/(x+2y)
=2x(x-2y)/(x+y)

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可以适当的加些括号，要不然看起来实在是混乱，还有容易让人误解。

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a3+b3 (a+b)3 a+b=4,ab=3,求a3+b3 已知a-b=3,求a3-b3-9ab 3．实数a,b满足a3+b3+3ab=1,则a+b= . 实数a,b满足a3+b3+3ab=1,则a+b= 已知a3+3ab+b3=1,求a+b(a和b都是实数) 10ab分之3a－3b×a的平方减b的2次方分之25a2方b3方 3a-3b/10ab*25a^b3/a^-b^= x^-4y^/x^+2xy+y^/x+2y/2x^+2xy(3a-3b)/(10ab)*(25a^b3)/(a^-b^)= (x^-4y^)/(x^+2xy+y^)/(x+2y)/(2x^+2xy)= a3-b3-a+b (a的3次方b-3a的平方b的平方+2a乘b3次方)除以(ab) 实数a,b满足a3（a的三次方）+b3+3ab=1 求a+b如题已知a+b=lg32+lg35+3lg2lg5,则a3+b3+3ab=______ 已知a+b=1,求证:a3+b3-3ab=1答案已知：a+b=3 ab=5 求a3b+2a2b2+2b3 已知a-b=3,那么a3-b3-9ab的值是多少? 已知a+b=3,ab=-8,则a3+b3= 已知a+b=3,ab=-1,则a3+b3=? a+b=3,ab=m-1,a3+b3=9,求m