20.脱式计算,能简算的简算
| $\frac{3}{8}$÷[($\frac{1}{5}$+$\frac{1}{4}$)×$\frac{3}{8}$] | (4+$\frac{1}{6}$)÷(1$\frac{1}{2}$-$\frac{2}{3}$) | ($\frac{3}{8}$+$\frac{1}{4}$+$\frac{1}{6}$)×48 |
| 7.47×1.25-1$\frac{1}{4}$+4.63×125% | ($\frac{14}{17}$×9-$\frac{6}{17}$×9)÷$\frac{27}{27}$ | 10.6-(6$\frac{3}{5}$+$\frac{1}{8}$÷12.5%) |
19.一个圆柱体底面直径为12分米,高是12分米,它的侧面展开后是( )
| A. | 正方形 | B. | 长方形 | C. | 扇形 |
18.与$\frac{5}{6}$的75%最接近的是( )
| A. | $\frac{1}{2}$ | B. | $\frac{3}{8}$ | C. | $\frac{1}{8}$ | D. | $\frac{7}{8}$ |
16.属于因数和倍数关系的等式是( )
0 132186 132194 132200 132204 132210 132212 132216 132222 132224 132230 132236 132240 132242 132246 132252 132254 132260 132264 132266 132270 132272 132276 132278 132280 132281 132282 132284 132285 132286 132288 132290 132294 132296 132300 132302 132306 132312 132314 132320 132324 132326 132330 132336 132342 132344 132350 132354 132356 132362 132366 132372 132380 199269
| A. | 2×0.25=0.5 | B. | 2×25=50 | C. | 2×0=0 | D. | $\frac{1}{4}$×2=$\frac{1}{2}$ |