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问题 选择题

下列运算正确的（　　）

A．2x+2y=2xy

B．5x+x=5x2

C．-3mn+mn=-2mn

D．8a2b-7a2b=1

答案

A、2x+2y不是同类项，不能合并；

B、5x+x=6x；

C、-3mn+mn=-2mn；

D、8a2b-7a2b=a2b．

故选C．

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                                                      Come to Joson's Store 
     Do you like ball games? We have many ball games. Soccer balls are 20 dollars. Volleyballs are 25
dollars each. Basketballs are 35 dollars each. Tennis rackets are 10 dollars each. Ping-pong balls are
dollars each. Ping-pong bats are 10 dollars each.
                                                      Welcome to Hnainei Store!
     Welcome to Huamei Clothes Store, please! We have jackets at a very good
                                                      Come and see at Hongxing Store!     
     Do you need school things? We sell pencils cases for only 2 yuan each. We have great pens for 5 yuan
each. A big notebook is 5 yuan and a small one is 3 yuan.
1. Jonson's Store sells _________.
A. computer games  
B. ball game things    
C. clothes
2. You can't buy  _________ at Huanei Store.
A. jackets        
B. skirts        
C. backpacks
3. We can buy a pencil case, a pen and a big notebook for_________  yuan.
A. 12      
B. 11    
C. 8
4. At Jonson's Store __________.
A. two soccer balls are 20 dollars
B. the volleyball and the basketball have the same(相同的) price
C. the tennis racket and the ping-pong bat have the same price
5. From the three ads, we know __________.
A. we can buy a sweater for 25 yuan at Huamei Store
B. we can't buy small notebooks at Hongxing Store
C. we can't buy food at the three store
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选择题

The sweater is _____ small for the child.[ ]

A. too many

B. too much

C. many too

D. much too

查看答案