1.упростите выражения
1)(x-2)(x+3)
2)(2x²-y²)(3y²-x²)
2.разложите на множители
1)xa+xb+6a+6b
2)x³-x²+x-1
3)ab-2a-2b+4
3.упростите и вычислите при x=-3
1)2-(x-1)(x+1)
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