1,已知3m=4n,则m/m+n +n/m-n -m^2/m^2-n^2=2,若1除以[a-b/a-c除以(b-a/b-c除以x/c-b)]=-1,则x=3,若3x+4/(x-2)(x+3)=A/x-2 +B/x+3 则A= ,B=

问题描述:

1,已知3m=4n,则m/m+n +n/m-n -m^2/m^2-n^2=
2,若1除以[a-b/a-c除以(b-a/b-c除以x/c-b)]=-1,则x=
3,若3x+4/(x-2)(x+3)=A/x-2 +B/x+3 则A= ,B=