还是几道分式问题!² ÷
3个回答

1.6ab/5c² * 10c/3b =4a/c

2.-7x/3yz * (负的 9y²/x²) =7x/3xy*9y^2/x^2=21y/x^2

3.2m/5n ÷ 4m²/10n^3 =2m/5n*10n^3/4m^2=n^2/m

4.-x/5y ÷ (负的 4x²/5y²) =x/5y*5y^2/4x^2=y/4x

5.4a+4b/5ab * 15a²b/a²-b² =4(a+b)/5ab*15a^2b/(a+b)(a-b)=12a/(a-b)

6.x²-4y²/x²+4x+4* x+2/3x²+6xy =(x+2y)(x-2y)/(x+2)^2*(x+2)/3x(x+2y)==(x-2y)/3x(x+2)

7.x²+2/x-6 * x²-36/x^3+x =x²+2/x-6 *(x+6)(x-6)/x(x^2+1)=(x^2+2)(x+6)/x(x^2+1)

8.y²-x²/5x²-4xy ÷ x+y/5x-4y =(y+x)(y-x)/x(5x-4y)*(5x-4y)/(x+y)

=(y-x)/x

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