18．直接写得数．
| 2.7÷0.3= | 3×0.32= | 2.25+1.75= | 15-5.2= |
| $\frac{7}{8}$-$\frac{3}{8}$= | 1-$\frac{9}{11}$= | $\frac{19}{20}$+$\frac{3}{20}$= | 1-$\frac{2}{7}$-$\frac{5}{7}$= |
| $\frac{10}{21}$-$\frac{8}{21}$= | $\frac{1}{8}$+$\frac{5}{8}$= | $\frac{9}{14}$-$\frac{5}{14}$= | $\frac{9}{16}$-$\frac{5}{16}$+$\frac{3}{16}$= |
17．一批布，做同样的上衣可做24件，做同样的裤子可做36件．这批布可做这样的衣服（ ）套．
0 140016 140024 140030 140034 140040 140042 140046 140052 140054 140060 140066 140070 140072 140076 140082 140084 140090 140094 140096 140100 140102 140106 140108 140110 140111 140112 140114 140115 140116 140118 140120 140124 140126 140130 140132 140136 140142 140144 140150 140154 140156 140160 140166 140172 140174 140180 140184 140186 140192 140196 140202 140210 199269
| A． | 6 | B． | 8 | C． | 14 | D． | 72 |