The seventh grade math workbook (1) in Chapter 4, review the answers to questions, page 20 also goes to page 2 1.

1-2X (this is a letter) ÷3 (it is recommended to write in fractional form)

- 1

Solve the equation:

1, using the method of addition, subtraction and elimination.

Solution: Y=0

x=2

2. Use addition, subtraction and elimination methods.

Solution:

Y=6

X=2

The following question is wrong, judge whether the equation is right or wrong. Needless to say, if it is right, it will not let us do it. I figured it out. X equals-half.

Y= 15/8

I hope it's right)

Group b: question 8: b

I can't work out the ninth question.

Question 10:

1000X+800X+500Y=7700

2X+Y= 10

Solution: X=3

Y=4

Suppose: He bought X men's basketball and table tennis, and Y football.

Project 1 1: Shopping Mall, (360+92) * 0.8 = 36 1.6

The shopping center can

B shopping mall

Buy MP4 first, and then stay in 40 yuan, you can get a rebate of 30*3=90 yuan.

40+90= 130〉92

So you can do both.

In a shopping mall, * * * used 36 1.6, leaving 400-36 1.6=38.4 yuan.

In Mall B, first use 360 yuan, 40+90-92=38, and then use 38 yuan.

So in 0.4 yuan, a shopping mall province,

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