1.单选题- (共9题)
的解是（ ）
使得代入后化简比较容易的变形是( )
，得
，得
| 捐款（元） | 20 | 40 | 50 | 100 |
| 人数 | 10 | | | 8 |
表格中捐款40元和50元的人数不小心被墨水污染已看不清楚、若设捐款40元的有x名同学，捐款50元的有y名同学，根据题意，可得方程组（ ）
A． | B． |
C． | D． |
使得代入后化简比较容易的变形是( )
2.选择题- (共15题)
What do you think the life in the future will be like？Here are some answers from some students.
Mary：There will be many machines (机器) and robots in factories.People only need to control (控制) them on their computers or phones without leaving home.
Jack：The weather in the future will be very hot.And many places will be under the sea.Many people won't live on the earth any more.They will have to go to other planets.
Linda：I think the life in the future will be nice.There will be a lot of flowers and trees.And cities will look like parks.
Henry：People will not need to eat food.They will live on special pills (药丸)．And they will hardly ever get ill.Everybody will be able to live to be over 100 years old.
It's so nice to {#blank#}1{#/blank#} {#blank#}2{#/blank#} you on New Year's Day!
(有两项多余)。
choose，history，tradition，eat，though, choice, So |
The mooncake is the most popular and important food on MidAutumn Day. But is it the only food?
In some places of China，the pumpkin(南瓜) is also the {#blank#}1{#/blank#} food on MidAutumn Day. In old days，poor families {#blank#}2{#/blank#}to eat pumpkins，because they couldn't afford(买得起) mooncakes.{#blank#}3{#/blank#}people live a good life now，they still eat pumpkins on MidAutumn Day.They believe it can bring them good health.
For people in Guangzhou，they enjoy {#blank#}4{#/blank#}river snails(田螺) on MidAutumn Day. They think the delicious food can help make their eyes bright.
Salted Duck(桂花鸭) is a common food for people in Jiangsu Province. It has a {#blank#}5{#/blank#} of over 2，500 years .And it is the most famous dish of Nanjing.
Is there any traditional food in your hometown on MidAutumn Day？What is it?
(有两项多余)。
choose，history，tradition，eat，though, choice, So |
The mooncake is the most popular and important food on MidAutumn Day. But is it the only food?
In some places of China，the pumpkin(南瓜) is also the {#blank#}1{#/blank#} food on MidAutumn Day. In old days，poor families {#blank#}2{#/blank#}to eat pumpkins，because they couldn't afford(买得起) mooncakes.{#blank#}3{#/blank#}people live a good life now，they still eat pumpkins on MidAutumn Day.They believe it can bring them good health.
For people in Guangzhou，they enjoy {#blank#}4{#/blank#}river snails(田螺) on MidAutumn Day. They think the delicious food can help make their eyes bright.
Salted Duck(桂花鸭) is a common food for people in Jiangsu Province. It has a {#blank#}5{#/blank#} of over 2，500 years .And it is the most famous dish of Nanjing.
Is there any traditional food in your hometown on MidAutumn Day？What is it?
3.填空题- (共5题)
，则x+y的值为_____．
的解是正整数，则整数P的值为______。
4.解答题- (共7题)
（1）有位同学是这么做的，①+②得4x=20，解得x=5，代入①得y=﹣3．
∴这个方程组的解为
．该同学解这个二元一次方程组的过程中使用了 消元法，目的是把二元一次方程组转化为 求解；（2）请你换一种方法来求解该二元一次方程组．
（1）根据题意，某同学列出尚不完整的方程组如下：
根据这位同学所列方程组，请你指出未知数x，y哪一个代表产品的质量，哪一个代表原料的重量：（注：x、y的单位均为吨），x表示 ，y表示 ；（2）在（1）中等式右边的括号里补全所列方程组；
（3）根据他所列方程组解得x=300，请你帮他解出y的值，并解决该实际问题．
，并把它的解集在数轴上表示出来．
；甲旅行社说：“如果校长买全票，则其余学生可享受半价优惠．”
乙旅行社说：“包括校长在内全部票价6折优惠”，若全票价为240元．
(1)设学生数为x，甲旅行社收费为y甲，乙旅行社收费为y乙，分别计算两家旅行社的收费 (表达式) ．
(2)当学生数量是多少时，两家旅行社的收费一样？
(3)就学生数x讨论，哪家旅行社更优惠．
| 月均用水量x（t） | 频数（户） | 百分比 |
| 0＜x≤5 | 6 | 12% |
| 5＜x≤10 | | 24% |
| 10＜x≤15 | | 32% |
| 15＜x≤20 | 10 | 20% |
| 20＜x≤25 | 4 | |
| 25＜x≤30 | 2 | 4% |
请解答以下问题：
（1）把上面的频数分布表和频数分布直方图补充完整；
（2）本次随机调查了多少户家庭？若该小区有1000户家庭，根据调查数据估计，该小区月均用水量超过20t的家庭大约有多少户？
-
【1】题量占比
单选题:(9道)
选择题:(15道)
填空题:(5道)
解答题:(7道)
-
【2】：难度分析
1星难题：0
2星难题：0
3星难题：0
4星难题：0
5星难题：0
6星难题：4
7星难题：0
8星难题：8
9星难题：9