Urgent svp c pour demain je n'y arrive pas c'est noter

Développer et réduire:
1). (3x+2) (x-5)+(x+7)(1-x)
2). (8t+1)(t-10)-(2t-4)(t+3)

Factoriser:
1). (x-7)²+3x(x-7)
2). x²-49
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