10.
如图,若△A′B′C′与△ABC关于直线AB对称,则点C的对称点C′的坐标是( )
| A. | (0,1) | B. | (0,-3) | C. | (3,0) | D. | (2,1) |
9.某公司去年的利润(总产值-总支出)为300万元,今年总产值比去年增加了20%,总支出比去年减少了10%,今年的利润为980万元,如果去年的总产值x万元,总支出y万元,则下列方程组正确的是( )
| A. | $\left\{\begin{array}{l}{x-y=300}\\{(1+20%)x-(1-10%)y=980}\end{array}\right.$ | B. | $\left\{\begin{array}{l}{x-y=300}\\{(1-20%)x-(1+10%)y=980}\end{array}\right.$ | ||
| C. | $\left\{\begin{array}{l}{x-y=300}\\{20%x-10%y=980}\end{array}\right.$ | D. | $\left\{\begin{array}{l}{x-y=300}\\{(1-20%)x-(1-10%)y=980}\end{array}\right.$ |
8.9的平方根是( )
0 293534 293542 293548 293552 293558 293560 293564 293570 293572 293578 293584 293588 293590 293594 293600 293602 293608 293612 293614 293618 293620 293624 293626 293628 293629 293630 293632 293633 293634 293636 293638 293642 293644 293648 293650 293654 293660 293662 293668 293672 293674 293678 293684 293690 293692 293698 293702 293704 293710 293714 293720 293728 366461
| A. | ±81 | B. | ±3 | C. | -3 | D. | 3 |