3.从家到学校小红要9分钟,小明要8分钟,小红和小明所行的速度比是( )
A. | 9:8 | B. | $\frac{1}{8}$:$\frac{1}{9}$ | C. | 8:9 |
20.直接写得数:
0 159550 159558 159564 159568 159574 159576 159580 159586 159588 159594 159600 159604 159606 159610 159616 159618 159624 159628 159630 159634 159636 159640 159642 159644 159645 159646 159648 159649 159650 159652 159654 159658 159660 159664 159666 159670 159676 159678 159684 159688 159690 159694 159700 159706 159708 159714 159718 159720 159726 159730 159736 159744 199269
3.5×$\frac{2}{5}$= | 1.28-0.72= | 0.75+$\frac{1}{4}$= | 0.32= | $\frac{3}{4}$÷6= |
$\frac{3}{4}$×$\frac{2}{3}$= | 1.25+0.5= | 2.8+7.4= | 2.1÷10%= | 1.5×100= |