Ответ:
1)(x-9)(x-8)= -8x-9x+72= -17x+72
2)(3y+2)(2y-3)= -9y+4y-6=-5y-6
3)(-5a+b)(2b+a)= -10ab-5+2+ab= -9ab-5+2
4)(4+x)(6x+7)= 24+28+6+7x= 24+34+7x
5)(9a+1)(2-2a+5)= 18-18+45a+2-2a+5= 18-16+43a+5
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Ответ:
1)(x-9)(x-8)= -8x-9x+72= -17x+72
2)(3y+2)(2y-3)= -9y+4y-6=-5y-6
3)(-5a+b)(2b+a)= -10ab-5+2+ab= -9ab-5+2
4)(4+x)(6x+7)= 24+28+6+7x= 24+34+7x
5)(9a+1)(2-2a+5)= 18-18+45a+2-2a+5= 18-16+43a+5