2.估计$\frac{\sqrt{5}+1}{2}$介于( )之间.
| A. | 1.4与1.5 | B. | 1.5与1.6 | C. | 1.6与1.7 | D. | 1.7与1.8 |
19.下列运算正确的是( )
| A. | a6÷a2=a3 | B. | a5-a2=a3 | ||
| C. | (3a3)2=6a9 | D. | 2(a3b)2-3(a3b)2=-a6b2 |
16.介于$\sqrt{3}$+1和$\sqrt{12}$之间的整数是( )
0 293322 293330 293336 293340 293346 293348 293352 293358 293360 293366 293372 293376 293378 293382 293388 293390 293396 293400 293402 293406 293408 293412 293414 293416 293417 293418 293420 293421 293422 293424 293426 293430 293432 293436 293438 293442 293448 293450 293456 293460 293462 293466 293472 293478 293480 293486 293490 293492 293498 293502 293508 293516 366461
| A. | 2 | B. | 3 | C. | 4 | D. | 5 |