Спрости вираз 1) (8a-3)(8a+3)-(7a+4)(8a+4); 2) 0.6m(2m-1)(2m+1)+0.3(6+5m)(6-5m); 3) (7-2x)(7+2x)-(x-8)(x+8)-(4-3x)(5+3x); -[tex]b^{2}[/tex]c(4b-[tex]c^{2}[/tex])(4b+[tex]c^{2}[/tex])+16[tex]b^{4}[/tex]c
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