Question

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1. [｛3又三分之二－2.75｝÷1又六分之五＋二又五分之四]乘十一分之五 2. 3又四分之一÷[8.475－｛5.4＋1又八分之三｝]×2又十五分之二。

Answer 1

[ { (3+ 2/3) - 2.75 } / (1+ 5/6) + (2+ 4/5) ] X 5/11
= [ ( 2/3 + 0.25 ) / ( 11/6 ) + 14/5 ] X 5/11
= [ ( 2/3 + 1/4 ) X 6/11 + 14/5 ] X 5/11
= [ 12/33 + 6/44 + 14/5 ] X 5/11
= ( 4/11 + 3/22 ) X 5/11 + 14/5 X 5/11
= ( 8/22 + 3/22 ) X 5/11 + 14/11
= 11/22 X 5/11 + 14/11
= 1/2 X 5/11 + 14/11
= 5/22 + 28/22
= 33/22
= 3/2
= 1.5

(3+ 1/4) / [ 8.475 - { 5.4 + (1+ 3/8) } X (2+ 2/15)
= 13/4 / [ 8.475 - (5.4 + 1 + 0.375) ] X 32/15
= 13/4 X 32/15 / [ 8.475 - 6.775 ]
= 13 X 8/15 / 1.7
= 26 X 4/15 X 10/17
= 104/3 X 2/17
= 208/51

Answer 2

1、1.65
2、-0.54363

Answer 3

第一问答案:3/2 第二问答案:208/51 过程见下: 点击[http://pinyin.cn/1MSR29ysL5P] 查看这张图片。