分数混合运算(1)

1、列式计算

  ① http://www.xfjy.cn/jxlw/UploadFiles_7693/200508/20050803080414124.gifhttp://www.xfjy.cn/jxlw/UploadFiles_7693/200508/20050803080415622.gif的和的 http://www.xfjy.cn/jxlw/UploadFiles_7693/200508/20050803080415631.gif是多少?

  ②6的 http://www.xfjy.cn/jxlw/UploadFiles_7693/200508/20050803080416906.gif减去 http://www.xfjy.cn/jxlw/UploadFiles_7693/200508/20050803080417538.gif是多少?

  ③4的 http://www.xfjy.cn/jxlw/UploadFiles_7693/200508/20050803080417322.gifhttp://www.xfjy.cn/jxlw/UploadFiles_7693/200508/20050803080418516.gif多多少?

2、简算

  (1) http://www.xfjy.cn/jxlw/UploadFiles_7693/200508/20050803080419589.gif            (2) http://www.xfjy.cn/jxlw/UploadFiles_7693/200508/20050803080420430.gif

  (3) http://www.xfjy.cn/jxlw/UploadFiles_7693/200508/20050803080420992.gif             (4) http://www.xfjy.cn/jxlw/UploadFiles_7693/200508/20050803080421116.gif

  (5) http://www.xfjy.cn/jxlw/UploadFiles_7693/200508/20050803080422937.gifhttp://www.xfjy.cn/jxlw/UploadFiles_7693/200508/20050803080422192.gif     (6) http://www.xfjy.cn/jxlw/UploadFiles_7693/200508/20050803080423443.gif

3、判断(对的画√,错的画×)

  (1)一个数乘分数,积一定小于这个数。(     )

  (2)6× http://www.xfjy.cn/jxlw/UploadFiles_7693/200508/20050803080423875.gifhttp://www.xfjy.cn/jxlw/UploadFiles_7693/200508/20050803080424319.gif×6的结果相同,但它们表示不同的意义。(    )

  (3)一件工作,平均每天做 http://www.xfjy.cn/jxlw/UploadFiles_7693/200508/20050803080425994.gif,那么3天完成全部工作的 。(    )

参考答案

1、 http://www.xfjy.cn/jxlw/UploadFiles_7693/200508/20050803080425293.gifhttp://www.xfjy.cn/jxlw/UploadFiles_7693/200508/20050803080426153.gifhttp://www.xfjy.cn/jxlw/UploadFiles_7693/200508/20050803080427414.gif

2、(1) http://www.xfjy.cn/jxlw/UploadFiles_7693/200508/20050803080428843.gif     (2) http://www.xfjy.cn/jxlw/UploadFiles_7693/200508/20050803080428454.gif    (3)2   

 (4) http://www.xfjy.cn/jxlw/UploadFiles_7693/200508/20050803080429607.gif        (5) http://www.xfjy.cn/jxlw/UploadFiles_7693/200508/20050803080430153.gif     (6) http://www.xfjy.cn/jxlw/UploadFiles_7693/200508/20050803080430317.gif

3、(1)×         (2)√      (3)√