1.2b分之a,3a²分之b,4ab分之c;2.2m²+3m分之1,3-2m分之2,4m²-9分之2m+5

问题描述:

1.2b分之a,3a²分之b,4ab分之c;
2.2m²+3m分之1,3-2m分之2,4m²-9分之2m+5