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the girl is very beautiful ,especially her f() smile (x+3)(y-5)=(x-2)(y+7)的解? 2*x^2-5*y^2=7有几组整数解请说明理由 X大于0,Y大于0 X+Y+XY=2 求X+Y的最小值 山地自行车链条包装上的规格是8速, 自行车链条HG73和HG53区别自行车九速链条HG73和HG53,有什么区别呢,感觉73要好点,但是好像53的价格要贵点. 因式分解：x^-4xy+4y^-z^ 定义域为R,周期为3的函数y=f（x）,若x∈（0,1）时,f（x）=log2x,则f（6.5）=? 函数y=log2x(3-x)的定义域是 用一个5个空格的十字框在月历表中框出不同的5个数,这5个数的和最小是几?最大是几? 若xy∈R+,xy^2=4,则x+y的最小值为 普通挂历表某一竖列4个数的和是54,这4个数是? 求这个雨滴素材 雨滴接近地面的过程可以看做匀速直线运动,此时雨滴的速度称为收尾速度.某同学在一本资料上看到,雨滴的收尾速度V与雨滴的半径r成正比,由此该同学对雨滴运动中所受的阻力F作了如下几种 因式分解x的平分-4xy-4+4y的平分 He gets home (at five )in the arternoon(对括号部分提问） I think Tom is at home .(改为否定句） .He does his homework at home.(改为否定句）People usually eat dinner (in the evening).(对括号部分提问）He has breakfast at seve Tom ______(leave)home after a while .But he sometimes _____(leave) home 6 o'clock.还要说明原因 Eevery day Tom went to the market to buy food and other things .Every day Tom went to the market to buy food and other things.He put them in a big basket but he was old and weak,so he always paid another man to carry the basket homefor him.But one Sa (x-32)/16-x/60=5/3 01.x+21-x=16.5, x +0.5×2.16％x－20％×0.5×2.16％x=504.32 怎么解,方程 a+b+c=9.ab+bc+ca=24求b取值范围 what was wrong with him同义句转换 she (is taking a photo of a beautiful girl.）对括号部分提问what was wrong with him同义句转换she (is taking a photo of a beautiful girl.）对括号部分提问 求The girl with the northern soul collection的歌词和翻译 Look for the girl with the broken smile? why?怎么翻译! Who does the girl go there with怎么翻译 I put down a girl of act with dignity最准的翻译 已知实数x、y满足2x-3y=4,并且x≥0,y≤1,则x-y的最大值是?最小值是?） 4（2.5+X）=32.8 这题怎么解? 试判断(x^2-2x-2)(x^2-2x)+9是否有平方根,说明理由 改下列句子中的错误：1 It's time to lunch.2 Is your sister have lunch at home?改下 根据句意和汉语提示完成句子 It isn't the first time for the girl to[ ][ ]{考虑} leaving home.