①ac分之2bc ②xy²分之(x+y)y ③(x+y)²分之x²+xy ④(x-y)²分之x²-y²
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①ac分之2bc ②xy²分之(x+y)y ③(x+y)²分之x²+xy ④(x-y)²分之x²-y²
①ac分之2bc ②xy²分之(x+y)y ③(x+y)²分之x²+xy ④(x-y)²分之x²-y²
①ac分之2bc ②xy²分之(x+y)y ③(x+y)²分之x²+xy ④(x-y)²分之x²-y²
①2b/a
②(x+y)/xy
③x/(x+y)
④(x+y)/(x-y)
1=a分之2b 2=xy分之x+y 3=(x+y)²分之x(x+y)=x+y分之x 4=(x-y)²分之(x+y)(x-y)=x-y分之x+y
①ac分之2bc
2bc/ac=2b/a
②xy²分之(x+y)y
(x+y)y/xy^2=(xy+y^2)/(xy^2)=1/y+1/x
③(x+y)²分之x²+xy
(x^2+xy)/(x+y)^2=[x(x+y)]/(x+y)^2=x/(x+y)
④(x-y)²分之x²-y²...
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①ac分之2bc
2bc/ac=2b/a
②xy²分之(x+y)y
(x+y)y/xy^2=(xy+y^2)/(xy^2)=1/y+1/x
③(x+y)²分之x²+xy
(x^2+xy)/(x+y)^2=[x(x+y)]/(x+y)^2=x/(x+y)
④(x-y)²分之x²-y²
(x^2-y^2)/(x-y)^2=(x-y)(x+y)/(x-y)^2=(x+y)/(x-y)
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1. 2bc/ac=2b/a
2. y(x y)/xy^2=(x y)/xy
3. (x^2 xy)/(x y)^2=x(x y)/(x y)^2=x/x y
4. (x^2-y^2)/(x-y)^2=(x y)(x-y)
④(x-y)²分之x²-y²
(x-y)*(x-y)=x²*(-2xy)*y²