几道巧算题、求解答啊啊、急【1+(1/2)+(1/3)+(1/4)】*【(1/2)+(1/3)+(1/4)+(1/5) 】-【1+(1/2)+(1/3)+(1/4)+(1/5)】*【(1/2)+(1/3)+(1/4)】【1+(1/2)】*【1+(1/4)】*【1+(1/6)】·····【1+(1/10)】*【1-(1/3)】*【1-(1/5)】·····【1-(1/3)】*【1-(1/10)】1/6×{6.75÷(5/12)-2.4+【4(1/4)】×【2(2/5)】}-【1(1/8)】-0.875

问题描述:

几道巧算题、求解答啊啊、急
【1+(1/2)+(1/3)+(1/4)】*【(1/2)+(1/3)+(1/4)+(1/5) 】-【1+(1/2)+(1/3)+(1/4)+(1/5)】*【(1/2)+(1/3)+(1/4)】
【1+(1/2)】*【1+(1/4)】*【1+(1/6)】·····【1+(1/10)】*【1-(1/3)】*【1-(1/5)】·····【1-(1/3)】*【1-(1/10)】
1/6×{6.75÷(5/12)-2.4+【4(1/4)】×【2(2/5)】}-【1(1/8)】-0.875

第二题有错误,后面这里)【1-(1/3)】*【1-(1/5)】·····【1-(1/3)】*【1-(1/10)】你检查一下.
第一题.分式最麻烦了...囧..
你不要被方程吓住,你仔细观察一下,把1+(1/2)+(1/3)+(1/4)这个因式看成一个就行了,然后就都消除了.
原式={【1+(1/2)+(1/3)+(1/4)】*【(1/2)+(1/3)+(1/4) 】+【1+(1/2)+(1/3)+(1/4)】*(1/5) } - {【1+(1/2)+(1/3)+(1/4)】*【(1/2)+(1/3)+(1/4)】+(1/5)*(1/2)+(1/3)+(1/4)】}
=(1/5)【1+(1/2)+(1/3)+(1/4)】-【(1/2)+(1/3)+(1/4) 】 }
=1/5
第三题简单...就是把小数都换成分数,然后一消除就行了
原式=1/6×{6(3/4)*(12/5)-2(2/5)+【17/4】×【12/5】}-【9/8】-(7/8)
=1/6*{27/4*12/5-12/5+51/5}-2
=1/6*{81/5-12/5+51/5}-2
=1/6*{120/5}-2
=4-2
=2
不明白再问我啊...做这题用3分钟,打这题用了30分钟.