Ответ:
2а^2-10ав+8b^2-6a^2+6ab-9b^2=-4a^2-4ab-b^2= -4*(1)^2-4*1*0,8-(0.8)^2=-4-3,2-0,64=-7,84.
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Ответ:
2а^2-10ав+8b^2-6a^2+6ab-9b^2=-4a^2-4ab-b^2= -4*(1)^2-4*1*0,8-(0.8)^2=-4-3,2-0,64=-7,84.