18.下列二次根式中,属于最简二次根式的是( )
| A. | $\sqrt{0.1}$ | B. | $\sqrt{\frac{1}{2017}}$ | C. | $\sqrt{48}$ | D. | $\sqrt{{a}^{2}+{b}^{2}}$ |
14.若关于x的不等式(a-5)x>2a-10的解集是x<2,则a的取值范围是( )
| A. | a<5 | B. | a>5 | C. | a<0 | D. | a>0 |
13.用一根长12cm的铁丝围成一个长方形,使得长方形的宽是长的$\frac{1}{2}$,则这个长方形的面积是( )
0 295393 295401 295407 295411 295417 295419 295423 295429 295431 295437 295443 295447 295449 295453 295459 295461 295467 295471 295473 295477 295479 295483 295485 295487 295488 295489 295491 295492 295493 295495 295497 295501 295503 295507 295509 295513 295519 295521 295527 295531 295533 295537 295543 295549 295551 295557 295561 295563 295569 295573 295579 295587 366461
| A. | 4cm2 | B. | 6cm2 | C. | 8cm2 | D. | 12cm2 |