1.There are 54 students in Class A and 48 students in Class B. If the number of students in Class A is twice that of Class B, let the number of students transferred from Class B be X, and the equation (? A there is no process to say, just follow the meaning of the question? There are twice as many students in class A as in class B? )。

a、54+x=2(48-x)？ b、48+x=2(54-x)？ c、54 x = 2×48？ d、48+x=2×54

2. A cultural mall sells two electronic pianos at the same time, each selling 960 yuan. In terms of cost, if the first company makes a profit of 20% and the other company loses 20%, then the shopping mall (? D, the original price of the first set is 960÷( 1+20%)=800 yuan; The original price of the second set is 960÷( 1-20%)= 1200 yuan, 1200+800-960×2=80 yuan.

The equation is based on the original price (1+20%)x=960 and (1-20%)Y=960).

A, don't make a loss? B. Earn 160 yuan? C, earn 80 yuan? D. Compensation for 80 yuan

3. Two-digit numbers. The sum of one digit and ten digits is 9. If the new number obtained by exchanging single digits with ten digits is 9 larger than the original number, the original two digits are (d,? Let the tenth digit be x,? 10X+(9-X)= 10(9-X)+X-9？ )。

a、54？ b、27？ c、72？ Day 45

4. If A and B are equal (a≠0), the solution of the unary linear equation ax+b=0 is (? C if a and b are equal (a≠0), there are two possibilities when a = b, the solution of the equation is-1, or the solution of the equation a=-b is 1).

a、 1？ b 、- 1？ C,-1 or 1? D, any rational number

Second, fill in the blanks

1. When a classmate solved the equation 5x- 1=◎x+3, he misread the number at ◎ and got x=

Students think

2, a commodity price 1375 yuan, 20% (80% of the price) sold, any profit is 10%, then the cost of the commodity is _ _ _ _.

1375×80%÷( 1+ 10%)= 1000

3. There is a cryptographic system whose principle is: input x→x+6→ output. When the output is 10, enter X = _ _ 4 _ _.

Solution? X+6= 10？ get

4. Known (2a+2)? +|3b-6|=0, then the value of the b power -ab of (3a) is __ 1 1__.

According to (2a+2)? +|3b-6|=0 Available: 2a+2=0, that is, a=- 1? ,? 3b-6=0 means b=2?

(3a) -ab=(-3) to the b power? -(- 1)×2= 1 1

5. The scoring rules of football match are: win a game and get 3 points, draw a game and get 1 point, and lose a game and get 0 point. A team played 14 games, six of which were negative, and * * * got 18 points, so the team won _ _ _ _.

Let x field 3x+( 14-x-6)= 18? x=5