13.一条路200米,已经修了$\frac{4}{5}$,修了多少米?列式为( )
A. | 200÷$\frac{4}{5}$ | B. | 200×$\frac{4}{5}$ | C. | 200÷5×4 | D. | 200÷4×5 |
12.学校七月份用电1800千瓦时,八月份节约了$\frac{1}{5}$,节约了多少千瓦时?列式为( )
A. | 1800×(1-$\frac{1}{5}$) | B. | 1800×$\frac{1}{5}$ | C. | 1800÷$\frac{1}{5}$ |
11.9吨的货物平均分10次运完,7次运了这批货物的( )
A. | $\frac{9}{7}$ | B. | $\frac{7}{10}$ | C. | $\frac{9}{10}$ |
10.比40的$\frac{5}{8}$少4的数是( )
A. | 25 | B. | 21 | C. | 23 |
9.当( )时,$\frac{4}{7}$×m>$\frac{4}{7}$.
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A. | m>1 | B. | m=1 | C. | m<1 |