6.直接写出得数
3×$\frac{3}{5}$= | $\frac{5}{8}×\frac{2}{5}$= | $\frac{2}{3}$×18= | $\frac{2}{3}×\frac{7}{4}$= |
$\frac{4}{7}÷2$= | $\frac{3}{4}÷\frac{3}{4}$= | $\frac{4}{9}÷\frac{2}{3}$= | $\frac{4}{3}$$÷\frac{8}{3}$= |
5.果园里有梨树75棵,梨树的棵树比桃树的2倍多15棵,果园里有桃树多少棵?如果设有桃树x棵,列方程解答错误的算式是( )
A. | 75-2x=15 | B. | 2x+15=75 | C. | 2x-15=75 |
4.$\frac{1}{9}$的倒数的$\frac{2}{3}$是( )
0 159977 159985 159991 159995 160001 160003 160007 160013 160015 160021 160027 160031 160033 160037 160043 160045 160051 160055 160057 160061 160063 160067 160069 160071 160072 160073 160075 160076 160077 160079 160081 160085 160087 160091 160093 160097 160103 160105 160111 160115 160117 160121 160127 160133 160135 160141 160145 160147 160153 160157 160163 160171 199269
A. | $\frac{2}{27}$ | B. | 6 | C. | $\frac{1}{6}$ |