(c+2)(c-3)=c*c-3c+2c-2*3=c2-c-6
(5x-2y)(4x-y)=20x2-5xy-8xy+2y2=20x2-13xy+2y2
(2a-1)(3a+4)=6a2+8a-3a-4=6a2+5a-4
(a-2)( -3a+6)=-3a2+6a+6a-12=-3a2+12a-12
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(c+2)(c-3)=c*c-3c+2c-2*3=c2-c-6
(5x-2y)(4x-y)=20x2-5xy-8xy+2y2=20x2-13xy+2y2
(2a-1)(3a+4)=6a2+8a-3a-4=6a2+5a-4
(a-2)( -3a+6)=-3a2+6a+6a-12=-3a2+12a-12
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б)
в)
г)