=42/9 - (-17/梁租正6)-20/橡悔9+(-37/6)
=42/9+17/6-20/9-37/型仿6
=(42/9-20/9)+(17/6-36/6)
=22/9-19/6
=44/18-57/18
=-13/18
负4又9分之7减负3又6分之1减2又9分之2加幅6又6分之1等于多少
=42/9 - (-17/梁租正6)-20/橡悔9+(-37/6)
=42/9+17/6-20/9-37/型仿6
=(42/9-20/9)+(17/6-36/6)
=22/9-19/6
=44/18-57/18
=-13/18