12.
如图,将△ABC沿BC方向平移得到△DCE,连接BD,AD,下列条件不能判定四边形ABCD是菱形的是( )
| A. | ∠ABC=∠ACB | B. | AB=AD | C. | ∠BAC=∠DAC | D. | AC⊥BD |
11.
如图,点D、E、F分别在△ABC的边AB、AC、BC上,且DE∥BC,EF∥AB,若AD=$\frac{1}{2}$BD,则$\frac{{S}_{△ADE}}{{S}_{△EFC}}$=( )
| A. | $\frac{1}{4}$ | B. | $\frac{1}{9}$ | C. | $\frac{1}{2}$ | D. | $\frac{1}{3}$ |
10.下列根式中,属于最简二次根式的是( )
| A. | $\sqrt{17}$ | B. | $\sqrt{12}$ | C. | $\sqrt{2.4}$ | D. | $\sqrt{\frac{1}{3}}$ |
4.一个边长是31.4厘米的正方形纸片,围成一个圆柱体的侧面(接头处不重叠),这个圆柱体的底面半径是( )
| A. | 5厘米 | B. | 10厘米 | C. | 15厘米 | D. | 20厘米 |
3.小英把1000元钱按年利率2.45%存入银行,存期为两年,那么计算到期时她可以从银行取回多少钱(不计利息税),列式正确的是( )
0 297170 297178 297184 297188 297194 297196 297200 297206 297208 297214 297220 297224 297226 297230 297236 297238 297244 297248 297250 297254 297256 297260 297262 297264 297265 297266 297268 297269 297270 297272 297274 297278 297280 297284 297286 297290 297296 297298 297304 297308 297310 297314 297320 297326 297328 297334 297338 297340 297346 297350 297356 297364 366461
| A. | 1000×2.45%×2 | B. | (1000×2.45%+1000)×2 | ||
| C. | 1000×2.45%+1000 | D. | 1000×2.45%×2+1000 |