作业帮
zuoye.qingguo.com

如图，四边形ABCD中，对角线AC与BD相交于点O，在①AB∥CD；②AO=CO；③AD=BC中任意选取两个作为条件，“四边形ABCD是平行四边形”为结论构造命题．
（1）以①②作为条件构成的命题是真命题吗？若是，请证明；若不是，请举出反例；
（2）写出按题意构成的所有命题中的假命题，并举出反例加以说明．（命题请写成“如果…，那么…．”的形式）

you're hungry,i'm hungry,too.(合为一句)
i'm just ( )( )( )you

i didn't do it,either(改为同义句）

用do或make的适当形式填空。
1.a lot of people hate to ( ) the dishea.
2.my mother ( ) a big birthday cake for me last night.
3.she often ( ) some shopping on weekends.
4.do you like to （ ) breakfast?
5.i want to be outside because i hate to ( ) chores

could i ( ) a bike from you?
sorry,i can't ( ) it to you.i will use it!
A.lend;lend
B.borrow;borrow
C.lend;borrow
D.borrow;lend

I don't like documentaries
( )
A.so do i
B.so i do
C.neither do i
D.either do i

he hates ( )a lie(谎言) to me.
A.tell
B.to told
C.telling
D.tells

I was doing my homework ( )my mother was cooking.
A.when
B.while
C.before
D.as soon as

他做了那道数学题，但是他没能算出它
he ( )( )the math problem,but he was not able to work ( )out

3.他不得不在外呆得很晚
he ( ）（ ）( ）（ ）late

2.她经常帮助她妈妈倒垃圾
she often helps her mother ( )( )( )( )?

1.请你把你的床铺整理一下好吗？
could you please ( )( )( )?

you can at ( )最少buy five dishes for me

you can't chat(聊天) with me now. you ( )help out with a few difficult things.
A.can
B.may
C.have to
D.must have to

there is some trash in the bag.please( )when you go to school tomorrow morning,
A.take it out
B.take out it
C.take them out
D.take out them

已知b<0,关于x的一元二次方程(x-1)^2=b的根的情况是
A.有两个不相等的实数根
B.有两个相等的实数根
C.没有实数根
D.有两个实数根

用配方法解下列方程（要过程）
（1）x^2-4x=0
（2）x^2-2根号3x+3=0
(3)x^2-6x=9991
(4)(x+2)^2=6x-3

用开平方法解下列方程（要过程）
（1）9x^2=25
（2）（x-3）^2-9=0

如图所示，把小圆形场地的半径增加5米后得到大圆形场地，场地面积增加了一倍，求小圆形场地的半径

（2x+1）-5=0