1. 1)=13ху+65х²-2ху+12х²=77х²+11ху
2)=15n³+5n² -10n³ +6n=5n³+5n²+6n
3)=x⁴+x³+x²-x³-x²-x=x⁴-x
2. 1)=-7a-ab+49+7b
2)=-x²+10x-6x+60=-x²+4x+60
3) =-75a²-135a-135-243=-75a²-135a-378
4)=m³-mn-m²n²+n³
5)=m²-2mn+2mn-4n²-m+2n=m²-4n²-m+2n
6)=5m(m²-mn+3mn-3n²)=5m(m²+2mn-3n²)=5m³+10m²n-15mn²
2x^2 + 11x + 34 = (x+6)^2
2x^2 +11x +34 = x^2 + 12x + 36
x^2 - x - 2 = 0
D = 1+ 8 = 9
x1 = (1+ 3)/2 = 2
x2 = (1-3)/2 = -1
Ответ: 2 и -1