14.实数-$\sqrt{27}$,0,($\sqrt{2}$)0,$\root{3}{125}$,0.7070070007…(相邻两个7之间0的个数逐次增加),3.$\stackrel{•}{2}\stackrel{•}{5}$,$\sqrt{(-5)^2}$,2π中,无理数有( )
| A. | 2个 | B. | 3个 | C. | 4个 | D. | 5个 |
7.在$\frac{2}{x}$,$\frac{1}{5}$(1-x),$\frac{{{x^2}-{y^2}}}{2}$,$\frac{1+a}{b}$,$\frac{{5{x^3}}}{y+1}$中分式的个数是( )
| A. | 1个 | B. | 2个 | C. | 3个 | D. | 4个 |
6.在实数4.$\stackrel{•}{2}\stackrel{•}{1}$,π,$\frac{22}{7}$,|-3|,$\root{3}{64}$,-$\sqrt{8}$中,无理数有( )
0 288538 288546 288552 288556 288562 288564 288568 288574 288576 288582 288588 288592 288594 288598 288604 288606 288612 288616 288618 288622 288624 288628 288630 288632 288633 288634 288636 288637 288638 288640 288642 288646 288648 288652 288654 288658 288664 288666 288672 288676 288678 288682 288688 288694 288696 288702 288706 288708 288714 288718 288724 288732 366461
| A. | 1个 | B. | 2个 | C. | 3个 | D. | 4个 |