12.函数y=2x-1的零点是( )
| A. | 0 | B. | (0,-1) | C. | $\frac{1}{2}$ | D. | $(\frac{1}{2},0)$ |
9.已知函数f(x)=Asin(ωx+φ)的图象如图所示,则该函数的解析式可能是( )

| A. | f(x)=$\frac{3}{4}$sin($\frac{3}{2}$x+$\frac{π}{6}$) | B. | f(x)=$\frac{4}{5}$sin($\frac{4}{5}$x+$\frac{1}{5}$) | C. | f(x)=$\frac{4}{5}$sin($\frac{5}{6}$x+$\frac{π}{6}$) | D. | f(x)=$\frac{4}{5}$sin($\frac{2}{3}$x-$\frac{1}{5}$) |
7.执行如图所示的程序框图,输出的x值为( )

0 225524 225532 225538 225542 225548 225550 225554 225560 225562 225568 225574 225578 225580 225584 225590 225592 225598 225602 225604 225608 225610 225614 225616 225618 225619 225620 225622 225623 225624 225626 225628 225632 225634 225638 225640 225644 225650 225652 225658 225662 225664 225668 225674 225680 225682 225688 225692 225694 225700 225704 225710 225718 266669
| A. | 4 | B. | 5 | C. | 6 | D. | 7 |