0.1×0.2= 6.6+4.4= 1.87×0= 0.6+0.6÷2=
3.6÷0.01= 2.7÷0.3= 7.2×10= 1.2×5÷1.2×5=
①4.4×25
②8.4×0.26+0.74
③50.8÷0.8÷1.25
④1.8×2.58+7.42×1.8
⑤0.79×99+0.79
⑥72+8÷2.5-30.2
每户每月用水10吨以内(含10吨),1.7元/吨。超出10吨部分,按2.5元/吨收取。