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What are the third and fourth questions on page 98 of the second volume of the new mathematics book for junior one? I forgot to take it home.
3.( 1)3u+2t=7，(2)2a+b = 3(3)2x-5y =-3(4) 1/2x-3/2y =- 1

6u-2t = 1 13a+b = 4-4x+y =-32x+y = 3

4. Class A goes to see a performance, with each ticket for Class A in 24 yuan and each ticket for Class B 18 yuan. If 35 students bought tickets just to go to 750 yuan, how many tickets did Party A and Party B buy?

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