4.化简$\frac{x}{(x-1)^{2}}$-$\frac{2}{(1-x)^{2}}$•(x-1)的结果是( )
| A. | $\frac{x-2}{(x-1)^{2}}$ | B. | $\frac{2-x}{(x-1)^{2}}$ | C. | $\frac{x+2}{(x-1)^{2}}$ | D. | $\frac{x}{(x-1)^{2}}$ |
3.若x>1,则化简$\sqrt{(1-x)^{2}}$的结果是( )
| A. | 1-x | B. | x-1 | C. | 1+x | D. | -(1+x) |
2.下列式子乘积的结果是有理数的是( )
| A. | $\sqrt{2}$×$\sqrt{5}$ | B. | $\sqrt{\frac{2}{3}}$×$\sqrt{\frac{27}{8}}$ | C. | -$\sqrt{2}$×$\sqrt{12}$ | D. | 3$\sqrt{2}$×2$\sqrt{3}$ |
1.已知x≠0,且x的立方与它本身相等,则$\frac{x}{{x}^{2}-6x+9}$÷$\frac{1}{x-2}$÷($\frac{1}{x-3}$)2的值是( )
| A. | 3 | B. | -1 | C. | 3或-1 | D. | 0 |
17.若|m+6|=-m-6,则m的取值范围为( )
| A. | m<6 | B. | m≤-6 | C. | m<-6 | D. | m>6 |
16.下列数据中不能确定物体位置的是( )
0 286330 286338 286344 286348 286354 286356 286360 286366 286368 286374 286380 286384 286386 286390 286396 286398 286404 286408 286410 286414 286416 286420 286422 286424 286425 286426 286428 286429 286430 286432 286434 286438 286440 286444 286446 286450 286456 286458 286464 286468 286470 286474 286480 286486 286488 286494 286498 286500 286506 286510 286516 286524 366461
| A. | 某市政府位于北京路32号 | B. | 小明住在某小区3号楼7号 | ||
| C. | 太阳在我们的正上方 | D. | 东经130°,北纬54°的城市 |