упростите выражение (а-4)^2- 2а(5а-4)
(а-4)^2- 2а(5а-4)=а^2-8a+16-10a^2+8a=-9a^2+16
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(а-4)^2- 2а(5а-4)=а^2-8a+16-10a^2+8a=-9a^2+16