5.
如图,与∠1是内错角关系的角有( )
| A. | 1个 | B. | 2个 | C. | 3个 | D. | 4个 |
4.已知|a-3|+$\sqrt{2b+a+1}$=0,则ba=( )
| A. | -6 | B. | 6 | C. | -8 | D. | 8 |
2.已知抛物线的顶点是(-$\frac{1}{3}$,$\frac{7}{3}$),与y轴交点的纵坐标为2,则它的解析式为( )
| A. | y=-3x2-2x+2 | B. | y=3x2+2x+2 | C. | y=-3x2+2x-2 | D. | y=-3x2-2x-2 |
19.在△ABC中,AB:AC=2:3,AD为∠A的平分线,则S△ABD:S△ACD=( )
| A. | 3:2 | B. | 2:3 | C. | 4:9 | D. | 9:4 |
18.下列说法错误的是( )
| A. | 过两点有且只有一条直线 | B. | 射线比直线小一半 | ||
| C. | 两点之间,线段最短 | D. | 0.5°等于30分 |
17.化简($\sqrt{3}$-2)200•($\sqrt{3}+2$)201的结果为( )
| A. | -1 | B. | $\sqrt{3}$-2 | C. | $\sqrt{3}$+2 | D. | -$\sqrt{3}$-2 |
16.下列各式中,正确的是( )
0 286352 286360 286366 286370 286376 286378 286382 286388 286390 286396 286402 286406 286408 286412 286418 286420 286426 286430 286432 286436 286438 286442 286444 286446 286447 286448 286450 286451 286452 286454 286456 286460 286462 286466 286468 286472 286478 286480 286486 286490 286492 286496 286502 286508 286510 286516 286520 286522 286528 286532 286538 286546 366461
| A. | $\sqrt{9+4}$=$\sqrt{9}$+$\sqrt{4}$ | B. | $\sqrt{4×9}$=$\sqrt{9}$×$\sqrt{4}$ | C. | $\sqrt{4-2}$=$\sqrt{4}$-$\sqrt{2}$ | D. | $\sqrt{\frac{25}{36}}$=$\sqrt{\frac{5}{6}}$ |