2.若实数a,b满足a2+3a=2,b2+3b=2,且a≠b,则(1+a2)(1+b2)=( )
| A. | 18 | B. | 12 | C. | 9 | D. | 6 |
1.
在平面直角坐标系xOy中,已知点B(0,2),点A在x轴正半轴上且∠BAO=30°.将△OAB沿直线AB折叠得△CAB,则点C的坐标为( )
| A. | (1,$\sqrt{3}$) | B. | ($\sqrt{3}$,3) | C. | (3,$\sqrt{3}$) | D. | ($\sqrt{3}$,1) |
13.已知二次函数y=ax2+bx+1(a≠0)的图象的顶点在第二象限,且过点(1,0).当a-b为整数时,ab=( )
0 282488 282496 282502 282506 282512 282514 282518 282524 282526 282532 282538 282542 282544 282548 282554 282556 282562 282566 282568 282572 282574 282578 282580 282582 282583 282584 282586 282587 282588 282590 282592 282596 282598 282602 282604 282608 282614 282616 282622 282626 282628 282632 282638 282644 282646 282652 282656 282658 282664 282668 282674 282682 366461
| A. | 0 | B. | $\frac{1}{4}$ | C. | -$\frac{3}{4}$ | D. | -2 |