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2/5×括号1/5+8/21÷(4/7)括号脱式计算

2/5×[1/5+8/21÷(4/7)] =2/5x(1/5+2/3) =2/5x(13/15) =26/75

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2/7+5/14+1/2 =4/14+5/14+7/14 =(4+5+7)/14 =16/14 =8/7

24×(1/4+5/6-7/8) =6+20-21 =5

1/2 2/3×括号3/4-1/6括号除以7/9脱式计算 解: 1/2+ 2/3×(3/4-1/6)除以7/9 =1/2+2/3×7/12÷7/9 =1/2+1/2 =1

1. 1/8*14/8/7 =7/4/8/7 =7/4*7/8 =49/*32 2. 9/14/(6/5-3/4)*7/24 =9/14/9/20*7/24 =9/14*20/9*7/24 =20/14*7/24 =5/12 第三小题题目再发准确点行吗

5/7+1/4-19/14脱式计算 =20/28+7/28-38/28 =27/28-38/28 =-11/28

原式=(4/5+1/4)X3/7十7/10 =21/20X3/7+7/10 =9/20+14/20 =23/20

七分之三乘以五分之一减七分之四除以五。 =3/7x1/5-4/7x1/5 =1/5x(3/7-4/7) =-1/5x1/7 =-1/35 =-35分之1 请采纳正确答案,你们只提问,不采纳正确答案,回答都没有劲!谢谢管理员推荐采纳!! 朋友,请【采纳答案】,您的采纳是我答题的动力,...

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