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9/8%1/7+1/8%6/7简便计算

9/8-1/7+1/8-6/7=(9/8+1/8)-(1/7+6/7)=10/8-1=5/4-1=1/4。 使用结合律。

答案见上图 望采纳

0.004+(6.875+1/8)-(5+9)/7=0.004+7-2=5.004

=72*(1/9+1/8) =72*1/9+72*1/8 =8+9 =17

7/8-括号7/8-1/7回括用简便方法计算 7/8-括号7/8-1/7回括 =7/8-(7/8-1/7) =7/8-7/8+1/7 =1/7

7/6×15/8+1/8×1/6 =(1+1/6)x15/8+1/8x1/6 =15/8+1/6x15/8+1/8x1/6 =15/8+1/6x(15/8+1/8) =15/8+1/6x2 =45/24+8/24 =53/24 =2又5/24 行家正解,不明白可以追问!祝您学习进步 满意请点击下面的【选为满意回答】按钮,O(∩_∩)O谢谢

解:根据提取公因式的简便方法, 原式=4/7x6/9+4/7x1/9 =4/7x(6/9+1/9) =4/7x7/9 =4/9

5/1x6/1+6/1x7/1+7/1x8/1+8/1x9/1+9/1x10/1 =5X6+6X7+7X8+8X9+9X10 =6X12+7X8+9X18 =6X(12+27)+7X8 =6X39+7X8 =234+56 =290

73 1/8×8/9-43 1/6×6/7 先将分数乘法做了,分子乘分子,分母乘分母,分子分母约分 =73*1/9-43*1/7 要通分 =73*7/63-43*9/63 =511/63-387/63 =124/63 =41/21

用推理的,你想一下1/n的函数图象,n越大,斜率越校即表现为两数之差越来越校所以1/6比1/7的差大于 1/7比1/8的差。 所以第二个比较大 (1/6-1/7)-(1/7-1/8)大于零

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