a^2-3a __ __=2a^2 2a

a^2-3a __ __=2a^2 2a 观察下图,数轴上ABCD四点对应的都是整数,若点A对应的数位a点B对应为b,且b-2a＝7那么数轴上原点是A、B、C、D中的哪一个?说明理由!__|__|__|__|__|__|__|__|__|__|__|__|__|_____→ A B C D 完形填空Dear Lily,Gold Coast(海岸) is really great!We __(1)__ a good time now.I __(2)__ this letter __(3)__ you at the swimming club on the beach（沙滩）.There are __(4)__ of people on the Gold Coast now.__(5)__ of them __(6)__ volleyball a 1.变为被动语态（1）He gave me a book.I __ __ a book.The book __ __ to me.（2）Someone heard Lucy play the flute just now.Lucy was __ __ __ the flute just now.（3）They saw her get on a bus.She was __ __ __on a bus.2.词形转换（1）Whe 已知点P(a,-2),点Q(3,b)关于原点对称,则a=__ ,b=__ 如图所示,已知数轴上有AB、C、D四点对应的有理数分别是a、b、c、d,且有c-2a=5,则原点应是______.图：__|__|__|__|__|__|__|__|__ 今晚就要~A B C D 如果两最简二次根式根号1+a与根号4a-2是同类根式,那么a=__?__ 2a²-4ab+4b²+2a+5有最__值,此时a=__,b=__. 实数a、b、c满足a=6-b,c^2=ab-9,则a=__,b=__,c=__ f(x)=ax^2+bx+3a+b是偶函数,且其定义域为[a-1,2a],则a=__,b=__ 4x*2+3x-2是__次__项式；-5/3a*2b-4/3ab+1/3是__次__项式. In the small towns of the United States in the __(1)__(nineteen) century,the general store was __(2)__ everyone bought the things he couldn’t make __(3)__ grow at home.What the stores sold __(4)__(tell) a great deal about __(5)__ life at that time. 抛物线y＝3x＾2－5开口向__对称轴是__顶点坐标是__它可以看作是抛物线__向__平移__个单位得到 具体点a 若a^2+b^2=1,则__ 求数独的解:1:2,9,__,5,4,__,__,__,__ __,__,__,__,__,__,__,__,__ __,__,3,9,__,__,__,6,__ 6,__,9,__,__,3,__,4,__,__,4,__,__,2,__,__,7,____,8,__,1,__,__,5,__2__,1,__,__,__,7,2,__,____,__,__,__,__,__,__,__,__ __,__,__,__,9,6,__,8,42:7,6,__,3,4,__,__, thinks a lot=thinks __ __ 3阶方阵A的特征值是（1,1,2）则︱A︱=__,A的逆的特征值=__,A的伴随矩阵的特征值=__ a^2-2ab-b^2-__=-2a^2-ab-3b^2