Sin 200 tg 405 cos500 ctg-25 определите знак

Question

Алгебра: Sin 200 tg 405 cos500 ctg-25 определите знак

anjelanartokova · Accepted Answer

1)2х²-8=2(х²-4)=2(х-2)(х+2) 2)18-2y²=2(9-у²)=2(3-у)(3+у) 3)kt²-k=k(t²-1)=k(t-1)(t+1) 4)32a³-2a=2a(16a²-1)=2a(4a-1)(4a+1) 5)2u³-2v³=2(u³-v³)=2(u-v)(u²+u*v+v²) 6)nx³+nz³=n(x³+z³)=n(x+z)(x²-x*z+z²) 7)w⁴-w=w(w³-1)=w(w-1)(w²+w+1) 8)z⁴+8z=z(z³+8)=z(z+2)(z²-2*z+4) 9)x⁴-16z⁴=(x²-4z²)(x²+4z²)=(x-2z)(x+2z)(x²+4z²) 10)81-k⁴=(9-k²)(9+k²)=(3-k)(3+k)(9+k²) 11)2a²-12a+18=2(a²-6a+9)=2(a-3)² 12)10x-5x²+5=5(2x-x²+1)=-5(x²-2x-1) 13)0,5u²+4uv+8v²=0.5(u²+8uv+16v²)=0.5(u+4v)² 14)-0,9x²-0,6xy-0,1y²=-0.1(y²+6xy+9x²)=-0.1(y+3x)²...

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