20.
如图,某学校有一块长方形花圃,有极少数人为了避开拐角走“捷径”,在花圃内走出了一条“路”AB,爱心小组想在A处树立一个标牌“少走■米,踏之何刃?”请你计算后帮她们在标牌的■填上适当的数字为2米.
19.化简($\sqrt{3}$+1)($\sqrt{3}$-1)+$\sqrt{12}$-$\root{3}{8}$的结果是( )
| A. | 4$\sqrt{3}$ | B. | 2$\sqrt{3}$ | C. | 3$\sqrt{2}$ | D. | 2$\sqrt{6}$ |
15.若14x6y2与-31x3my2的和是单项式,则式子12m-24的值是( )
| A. | -3 | B. | -5 | C. | -4 | D. | 0 |
14.一个两位数,十位数字是x,个位数字比十位数字的2倍少3,这个两位数是( )
0 293306 293314 293320 293324 293330 293332 293336 293342 293344 293350 293356 293360 293362 293366 293372 293374 293380 293384 293386 293390 293392 293396 293398 293400 293401 293402 293404 293405 293406 293408 293410 293414 293416 293420 293422 293426 293432 293434 293440 293444 293446 293450 293456 293462 293464 293470 293474 293476 293482 293486 293492 293500 366461
| A. | x(2x-3) | B. | x(2x+3) | C. | 12x-3 | D. | 12x+3 |