4.口算小博士.
$\frac{1}{3}$+$\frac{5}{6}$= | $\frac{3}{16}$×4= | $\frac{1}{2}$÷$\frac{1}{2}$= | $\frac{6}{17}$×0×$\frac{3}{5}$= |
$\frac{3}{10}$×$\frac{2}{9}$= | 18÷$\frac{1}{2}$= | 0÷$\frac{1}{99}$= | ($\frac{2}{7}$+$\frac{5}{7}$)×$\frac{1}{9}$= |
3.一台电风扇八折销售,现价是240元,原价是( )元.
A. | 300 | B. | 200 | C. | 360 |
2.1、$\frac{1}{4}$、$\frac{1}{9}$、$\frac{1}{16}$、( ),( )里应填( )
A. | $\frac{1}{25}$ | B. | $\frac{1}{21}$ | C. | $\frac{1}{36}$ |
1.甲的$\frac{3}{5}$等于乙的$\frac{3}{4}$(甲、乙不为0),甲乙的关系( )
A. | 甲>乙 | B. | 甲<乙 | C. | 甲=乙 | D. | 无法判断 |
20.一次数学测验中,全班56人,成绩优秀的有35人,优秀率是( )
0 159281 159289 159295 159299 159305 159307 159311 159317 159319 159325 159331 159335 159337 159341 159347 159349 159355 159359 159361 159365 159367 159371 159373 159375 159376 159377 159379 159380 159381 159383 159385 159389 159391 159395 159397 159401 159407 159409 159415 159419 159421 159425 159431 159437 159439 159445 159449 159451 159457 159461 159467 159475 199269
A. | 80% | B. | 83% | C. | 62.5% |