標題:
小5數學題!急~20點(異分母分數+-混合)
發問:
分數表示方法:1又2分1=1又1/2 1.2又1/5+2又1/4-3又1/2 2.5又3/4-1又2/3+3又1/2 3.172又5/6-751/2+42又2/3 4.34又3/4-5又5/8+34又3/4 我要埋通左分個分母!!!唔該 更新: 3.172又5/6-75又1/2+42又2/3
最佳解答:
1. 2又1/5+2又1/4-3又1/2 =11/5+9/4-7/2 =44/20+45/20-70/20 =19/20 2. 5又3/4-1又2/3+3又1/2 =23/4-5/3+7/2 =69/12-20/12+42/12 =91/12 3. 172又5/6-751/2+42又2/3 =1037/6-751/2+128/3 =2074/12-4506/12+512/12 = -1920/12 =160 4. 34又3/4-5又5/8+34又3/4 =139/4-45/8+139/4 =278/8-45/8+278/8 =511/8 唔知系唔系都岩曬~ 話曬手算 xd 加油呀~ 瞭解之中嘅計算方法就計得熟咖啦~ 記得約簡啊！ 2010-10-22 17:42:15 補充： 第3題你個751/2冇打錯咖呵？系假分數啊呵？ 自己功課要自己努力！同意樓上 唔好靠上網問哦~
其他解答:
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1. 2又1/5+2又1/4-3又1/2 =11/5+9/4-7/2 =44/20+45/20-70/20 =19/20 2. 5又3/4-1又2/3+3又1/2 =23/4-5/3+7/2 =69/12-20/12+42/12 =91/12 3. 172又5/6-751/2+42又2/3 =1037/6-751/2+128/3 =2074/12-4506/12+512/12 = -1920/12 =160 4. 34又3/4-5又5/8+34又3/4 =139/4-45/8+139/4 =278/8-45/8+278/8 =511/8|||||. 2又1/5+2又1/4-3又1/2 =11/5+9/4-7/2 =44/20+45/20-70/20 =19/20 2. 5又3/4-1又2/3+3又1/2 =23/4-5/3+7/2 =69/12-20/12+42/12 =91/12 3. 172又5/6-751/2+42又2/3 =1037/6-751/2+128/3 =2074/12-4506/12+512/12 = -1920/12 =160 4. 34又3/4-5又5/8+34又3/4 =139/4-45/8+139/4 =278/8-45/8+278/8 =511/8 下次自己計啦 考試加油>_
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