2.直接写出得数
125×8= | 6.10-6.1= | 0÷18= | 0.75×100= |
3-0.06= | 5.6÷100×10= | 4.28+5.72= | 25×36= |
4.69+1.09-0.69= | 450×20= | 302×98≈ | 1198÷31≈ |
20.
口算. (1)27+68= | (2)910-540= | (3)18×40= | (4)910÷70= |
(5)78-0.8= | (6)3÷12= | (7)6.3÷0.1= | (8)36×25%= |
(9)$\frac{9}{4}$+$\frac{3}{4}$= | (10)3-$\frac{2}{5}$= | (11)$\frac{5}{6}$×$\frac{3}{6}$= | (12)$\frac{1}{2}$÷$\frac{1}{4}$= |
(13)3.48+6.52= | (14)1.02-0.43= | (15)0.25×0.8= | (16)12.6÷3= |
(17)298+405≈ | (18)48×51≈ | (19)449÷48≈ | (20)803-398≈ |
17.一个自然数的最小倍数是24,这个数的约数有( )个.
0 161438 161446 161452 161456 161462 161464 161468 161474 161476 161482 161488 161492 161494 161498 161504 161506 161512 161516 161518 161522 161524 161528 161530 161532 161533 161534 161536 161537 161538 161540 161542 161546 161548 161552 161554 161558 161564 161566 161572 161576 161578 161582 161588 161594 161596 161602 161606 161608 161614 161618 161624 161632 199269
A. | 2 | B. | 4 | C. | 6 | D. | 8 |