1.Решите уравнение:
1.(x²-1)(x²+3)=(x²+1)²+x;
2.x²-49=0;
3.x²+4x+4=0;
4.(x-2)²-49=0;
5.x²+x³-x-1=0.
2.Упростите выражение:
1.9x²-(c+3x)(c-3x);
2.3(x+3)³-(x+2)(x-2)+2(x+2)².
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