Спростіть вираз:
1) (x+2)(х-5) - 3x(1-2х); .
у 2) (a +3)(a - 2) + (а – 3)(a +6);
3) (x-7)(3x-2)-(5х+1)(2х-4)
1) (x+2)(х-5) - 3x(1-2х); .
у 2) (a +3)(a - 2) + (а – 3)(a +6);
3) (x-7)(3x-2)-(5х+1)(2х-4)
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Answers & Comments
Ответ:
1)=x2-5x+2x-10-3x+6x2=7x2-6x-10
2)=a2-2a+3a-6+a2-6a-3a-18=2a2-8a-24=a2-4a-12
3)6x2+2x-21x-14-10x2+20x-2x+4=-4x2-21x+10