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Алия116
@Алия116
February 2022
1
12
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Упростите выражения:
а) -3х(2-x)+(3x+1)(x-2);
б) 3(2х-1)^2+12х;
в) (х+3)^2-(х-2)(х+2).
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girl2303
А) -3x(2-x)+(3x+1)(x-2)=-6x+3x^2 + 3^2 -6x+x-2=6x^2 -11x-2 б) 3(2x-1)^2 +12x=3(4x^2 -2x+1)+12x=12x^2 -6x+1+12x=12x^2+6x+1 в) (x+3)^2 -(x-2)(x+2) = x^2 +6x+9-x^2+4=6x+13
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