(1):①4×5=20,可以租5个小房子;②2×6+2×4=20,可以租2个大房子,2个小房子.答::①可以租5个小房子;②可以租2个大房子,2个小房子.(2)①6×5=30(元)②8×2+6×2=16+12=28(元)30元>28元,所以租2个大房子和2个小房子.答:租2个大房子和2个小房子省钱.