A( a+ 6) - ( 2b - 3)(2b + 3) = a² + 6a - ( 4b² - 9) = a² + 6a - 4b² + 9 = (a²+6a+9) - 4b²=
= ( a + 3)² - (2b)² = ( a +3 - 2b)(a+ 3 + 2b)
В сухарях больше углеводов
(х-3)(3-х)=-(x-3)(x-3)=-(x-3)²=-(x²-6x+9)=-x²+6x-9
(2а²- в)(в-2а²)=-(b-2a²)(b-2a²)=-(b-2a²)²=-(b²-4a²b+4a⁴)=-b²+4a²b-4a⁴
(3х+2у)(-3х-2у)=-(3x+2y)(3x+2y)=-(3x+2y)²=-(9x²+12xy+y²)=-9x²-12xy-y²
(-с²-2d)(с²+2d)=-(c²+2d)(c²+2d)=-(c²+2d)=-(c⁴+4c²d+4d²)=-c⁴-4c²d-4d²