绿矾的化学式

第三段 442*25-358*( ) 填上一个数并简便计算正方形纸这一次，沿折痕剪开，能剪出什么图形？锐角三角形 钝角三角形 梯形 等边三角形.吃饭了 为什么我回答了不少问题,有的被采纳了,团队贡献只有2分?分是怎么算的? 在O里和横线上填上相应的运算符号和数868_52_48=868O{52+ } 1500_28_272= _{28O272} 415_74_26 O{ O } 求解! 求f(x)=sin^2θ+2sinθ*cosθ+3cos^2θ的最小值 回答我2道题, yes there are 和yes they are有什么区别呢 Are there any apples 答语是Yes,there are.还是 Yes,they are. 英语改错 Are there any students in the room?Yes,they are.A.any B.in c.they哪个错了,应该改成什么? Are there any books in the bag?Yes,they are.里面的哪个词错了? Are______coats yours?Yes,they are.A.the B.that C.this D.ther are these men's coats yours?yes,they are.为什么不是arethese man's coats yours?yes,they are -Are these coats_____ -Yes,they're ours. 1.--Are these yours?--Yes,they're_____shoes1.--Are these yours?--Yes,they're_____shoesThanks2.--Are these_____?--No,they aren't.Mine are black. A:Whose ___ are these?B:These coats are too big for me.They're ___ mine.连接上面的.C:Those coats are mine.They're my ___ clothes 动物的成语是什么 已知sinα=3/5,α∈（派/2,派）求cos（α+派/3）,sin2α,tan2α的值 A:What's this in English B:It's a jacket.A:What color is it B:It's blue A:Yes,it's a___ Do you have any time this afternoon?Yes,---------------- A What are you B.What' going C.What's upD.What's the matter Is this your chair?Yes,it's 改错 247*342 巧算 900-65+235巧算 ±算术平方根5 这表示什么 已知α∈（π,2π） sinα+cosα=1/5 求sinα*cosα sinα-cosα 已知sinα+cosα=1/5,π 144的算术平方根是多少? √144= √144 是算术平方根还是平方根 平方差公式（2x+3）（2x-3）答案是4x²-9还是4x²+9? (2x-y)(-y-2x)用平方差公式应用 十六分之九的算术平方根是多少 要用符号表示求大神帮助 算术平方根的符号表示 求下列个数的算术平方根,并用符号表示出来（7.1）² （-3.5）² 2.25 2¼一个小时内,