a-b=5,b-c=3,(c-a)(2b-a-c)= a-b=5,b-c=3,(c-a)(2b-a-c)=
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![a-b=5,b-c=3,(c-a)(2b-a-c)= a-b=5,b-c=3,(c-a)(2b-a-c)=](/uploads/image/z/7170281-17-1.jpg?t=a-b%3D5%2Cb-c%3D3%2C%28c-a%29%282b-a-c%29%3D+a-b%3D5%2Cb-c%3D3%2C%28c-a%29%282b-a-c%29%3D)
a-b=5,b-c=3,(c-a)(2b-a-c)= a-b=5,b-c=3,(c-a)(2b-a-c)=
a-b=5,b-c=3,(c-a)(2b-a-c)=
a-b=5,b-c=3,(c-a)(2b-a-c)=
a-b=5,b-c=3,(c-a)(2b-a-c)= a-b=5,b-c=3,(c-a)(2b-a-c)=
(c-a)(2b-a-c)
=[(a-b)+(b-c)]·[(b-c)-(a-b)]
=(5+3)(3-5)
=-16