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如图,DB为半圆的直径,且BD=2,A为BD延长线上一点,AC切半圆于点E,BC⊥AC于点C,交半圆于点F.已知BD=2,设AD=x,CF=y,求y关于x的函数解析式并求y的取值范围.我知道答案,就是不知道范围是怎么求出来的.为 已知,如图所示,AC=DB,AD垂直于AC,BC垂直于BD,求证AD=BC 如图,DB为半圆的直径,A为BD延长线上一点,AC切半圆于点E,BC⊥AC于点C,交半圆于点F．已知BD=2,设AD=x,CF=y,则y关于x的函数解析式是y=x/(x+1)．那么y的取值范围呢? The department store is reported to（ ）at midnight last night.A have been caught fire B have caught fire 为什么选B he did not go to bed until midnight last night 同义句he( )( )( )midnight last night China is no longer what it used to be 为什么用what不用that? 1.China is no longer what it used to be.这个句子是神从句,答案说是表语从句,可是,表语从句不是直接放在be或系动词后面吗?2.We heard the news that our team had won.这句是宾语从句吗，不是同位语从句吗？ China is no longer what it used to be为什么用whatno longer 怎样理解（成分） e^[(3x+9)^(1/2)]dx ∫(3x-1)／(x^2+9)dx每一步都要详细 一个圆柱体粮仓的底面周长是25.12m,这个圆柱体粮仓的体积是多少立方米? 用如果.如果.人类的生活会受到严重的影响造句 用英语造句"中国人口有多少?" 是人类的母亲,是生命的摇篮(造句)急 The mountain village is no longer ____it used to be.A.which B.that C.as D.what 1/3×1/4=1/2×1/6写成比例式是? He sat me at the cinema A、at the front of B、in the front of C、in front of 选词填空 Were's the hospital? It's ( )the cinema. A,in front of B,in front of C,in front (5y-1/0.3)-(0.3y-0.12/0.02)=1 求y (5y-1/0.3)-(0.3y-0.12/0.02)=1 求y y÷3×9－﹙5y－3y﹚＝1怎么算 数学角的计算, 数学中成对出现的角有哪些在七下为止学过的6种成对出现的角有哪些？ 直角三角形ABC ∠C=90° AB=2AC 求∠A∠B的度数三角形ABC AC=2AB ∠B=60° 求∠A∠C的度数怎么求 可不可以根据那两个条件就直接求出∠A∠B∠C的度数 用方程解决下列题一条围巾价钱是87元是一个口罩的3倍一个口罩多少元 She went to the book store and bought____A dozen booksB dozens of books where did she disappear to?she went to that jewellery store ___the streetA acrossB nearC toD form 帮忙解决下列方程题.1.X(X-14)=O 2.的平方X+12X+27=O 3.X的平方=X+56 4.X(5X+4)=5X+42.2(X+3)的平方=X(X+3) 4.方程X的平方+2X+1=0的根为X1=____ X2=____ X1+X2=____ X1X2=____(2)方程X的平方-3X-1=0的根为X1=____ X2=____ X1+X2=____ 如图所示电路,R1=R2=4欧,R3=R4=2欧,Uab=6伏,求:电流表A1和A2的示数(不计电流表的内阻) 为什么A1测量如图所示电路,R1=R2=4欧,R3=R4=2欧,Uab=6伏,求:电流表A1和A2的示数(不计电流表的内阻)为什么A1测量的 2.I went to the department store with Danny.对画线部分提问 —————————————— 帮忙解决下列方程题.急.帮忙解决下列方程题.1.(2X^2+7X-8)(2X^2+7X-3)-6=02.（2y+1)^2-8(2y+1)+15=03.(x+2)(x+3)(X+4)(X-5)-44=0要求有过程.在1：50之前解决.若结果正确. as she round the huge department store译成汉语