(8b-9)(9b+8)-9b(8b+9) при b=-9.3

Question

(8b-9)(9b+8)-9b(8b+9) при b=-9.3

Answer 1

72b2+64b-81b-72-72b2-81b=-98b-72=-98•(-9,3)-72=911,4-72=839,4

Answer 2

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