问题 解答题

计算

(1)23÷(-2)-1

(2)(5+2x)(5-2x)

(3)(x-2)(x-3)-(x-1)2

(4)2x5x5+(-x)2x3(-x)7÷(-x2

答案

(1)原式=8÷(-

1
2
)=-16;

(2)原式=25-4x2

(3)原式=x2-3x-2x+6-(x2-2x+1)=x2-3x-2x+6-x2+2x-1=-3x+5;

(4)原式=2x10-x12÷(-x2)=2x10+x10=3x10

选择题
阅读理解

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                                                                                                             Tel:873-8873

                                                        Dessert House

     We have three kinds of desserts: small, medium and large. A small dessert with strawberries, bananas and ice cream is 10 RMB. A medium dessert with apples, tomatoes and cheese is 12 RMB. A large dessert with pears, potatoes and ice cream is 15 RMB.

     Welcome to our house.

                                                                                                            Tel:843 - 8734

                                                        Noodle House

     Special 1 is chicken and cabbage noodles, and the large bowl is just 4 RMB and the small 2 RMB. Special 2 is mutton and carrot noodles, and the large bowl is only 5 RMB and the small 2. 5 RMB. Special 3 is beef and

potato noodles. The large bowl is 4 RMB and the small 2 RMB. Special 4 is tomato and egg noodles. The large bowl is only 3 RMB and the small l. 5 RMB. Large drinks are only 5 RMB. And all the fruits are free(免费的).

     Come and get your noodles today!             

1. I have 40 RMB, and I can buy _____ kind (s) of desserts.

A. one        

B. two          

C. three        

D. four

2. Maria is calling at 843-8734. She may order _____.

A. some dessert and a bowl of noodles

B. two bowls of noodles and some drinks

C. ice cream and some fruit

D. some rice and drinks

3. Today we order a large dessert, two small bowls of mutton and carrot noodles and a large bowl of tomato

and egg noodles. We need to pay _____ RMB.

A. 26          

B. 23            

C. 20            

D. 25

4. Linda likes dessert very much but she doesn't eat tomatoes or potatoes. She can eat _____.        

A. a large dessert

B. a medium dessert

C. a small dessert

D. a large and a medium dessert

5. Tom and his sister Cindy go to Noodle House. Tom wants a small bowl. They only have 7 RMB and Cindy

doesn't eat eggs or beef. They can eat a large bowl of _____ noodles and a small bowl of _____ noodles.

A. beef and potato; chicken and cabbage

B. chicken and cabbage; mutton and carrot

C. tomato and egg; beef and potato

D. tomato and egg; chicken and cabbage