(1)20 1 1 On September 6th, 2008, the temperature difference was 10℃, the highest temperature was t℃, and the lowest temperature was 2/3t℃.

(2) The number of students in Grade 7 is n, of which 45% are boys and girls110;

(3) The purchase price of a commodity is one yuan, and the selling price is 1. 1 times of the purchase price. Now the price of each commodity is reduced by 10 yuan, and the current price is 2 10 yuan;

(4) In five days, Xiaohua * * * planted 60 trees and Xiaoming * * * planted X (x

2. Solve the equation:

⑴4/3-8X=3- 1 1/2X

⑵0.5X-0.7=6.5- 1.3X

⑶ 1/6(3X-6)=2/5X-3

⑷( 1-2X)/3 =(3X+ 1)/7-3

3. When x is a value, the values of the following two formulas are equal?

(1) X-(X- 1)/3 and 7-(X+3)/5

2/5x+(X- 1)/2 and 3(X- 1)/2-8/5X