求关于英国世博或英国的资料，要求彩色，我打印用，急
2(√x+√(y-1)+√(z-2))=x+y+z(√x)^2+(√(y-1))^2+(√(z-2))^2+1+1+1-2(√x+√(y-1)+√(z-2))=0(√x-1)^2+(√(y-1)-1)^2+(√(z-2)-1)^2=0 √x=1, √(y-1)=1 √(z-2)=1x=1 y=2 ,z=3yz+2x=2*3+2*1=8yz+2x的平方根=2√2
翻译成英文
I was surprised that the rapid changes in public attitudes, from the fear of liability hesitant to borrow from the banks of the keen. I guess changing the time is ripe. Several major cities in China recently made a survey, about half of the urban population still do not spend borrowed money to buy consumer goods, but the new ideas about consumption share of the site is getting wider. I personally doubt it is related to China's consumers, they do not know the risk is less waiting for consumers to consider, I am worried that some people have to learn from the lessons of the importance of living within our means. Jiabao Friends of luxury to a new house to visit, we saw the same old thing: his parents bed room. It appears that how disharmony. Friend has this complacency, this is his only did not heed the views of local designers. The old bed of his parents when they are most destitute purchased several decades, this bed is that they toil day after the most peaceful of resting. Friends naturally humor, said: We are brothers and sisters are all products of this bed yet. Friend's luxury home, the parents just to mention a living conditions: reservations beds. For young people, the popular synonym is lost, but for older people, only bad thing was lost, the old but useful items discarded, let alone every day sleep quietly beds, is not able to imagine. Friends at first did not understand the parents, stubborn, designers also made the beds when the antique converted compromise. Since emotions can not be discarded, there should be reform do? 1 Introduction awaken dreamer - this old bed, has become a friend home in the Heart of his biggest Jiabao. (Formerly contained in Lianhe Zaobao website, the author Jinyu Tian)
一组对角相等的四边形是平行四边形
四边形ABCD中,角A=角C=90°，角B=70°，角C=110°
sina+cosa=1\\\/3 求tan^3+cot^3
sina+cosa=1\\\/3两边平方sin²a+cos²a+2sinacosa=1\\\/91+2sinacosa=1\\\/9sinacosa=-4\\\/9tan³a+cot³a=sin³a\\\/cos³a+cos³a\\\/sin³a=(sin^6a+cos^6a)\\\/sin³a*cos³a分子=(sin²a+cos²a)³-3sin^4acos²a-3sin²acos^4a=1-3sin²cos²(sin²a+cos²)=1-3*(sinacosa)²*1=11\\\/27分母=(sinacosa)³=-64\\\/729所以原式=-297\\\/64
