奥数题,简便计算,帮帮我啊,谢谢大家!
3个回答
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(1)=6÷[8/6-2/6]×6=6÷1×6=36
(2)=2.5×(0.36-0.125)=10/4×0.235=2.35÷4=0.5875
(3)=(362+548×361)/[(361+1)×548-186]=(362+548×361)/[361×548-+548-186]
=(362+548×361)/(548×361+362)=1
(4)=(1/3-1/5)/2+(1/5-1/7)/2+(1/7-1/9)/2+(1/9-1/11)/2+(1/11-1/13)/2+(1/13-1/15)/2
=(1/3-1/15)/2
=4/15/2
=2/15
(2)=2.5×(0.36-0.125)=10/4×0.235=2.35÷4=0.5875
(3)=(362+548×361)/[(361+1)×548-186]=(362+548×361)/[361×548-+548-186]
=(362+548×361)/(548×361+362)=1
(4)=(1/3-1/5)/2+(1/5-1/7)/2+(1/7-1/9)/2+(1/9-1/11)/2+(1/11-1/13)/2+(1/13-1/15)/2
=(1/3-1/15)/2
=4/15/2
=2/15
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