(-7m²-8n²) (-m²+3n²)=7m^4-21m^2n^2+8m^2n^2-24n^4=7m^4-13m^2n^2-24n^4
(8x²-3xy) (3x³-xy)=8 x^5+8x^3y-9x^6y+3x^2y^2
<span>(7х³y²-xy)(-2x²y²+5xy³).=-14x^5y^4+35x^4y^5+2x^3y^3-5x^2y^4</span>
<span>2k+5t больше 100 ........</span>
(x²)²=t x²=t x∧4=t²
t²-13t+36=0
D=b²-4ac D=169-144=25
t=13-√25/2=13-5/2=4
t=13+√25/2=13+5/2=9
x²=4 (x-2)(x+2)=0 x=2; x=-2
x²=9 (x-3)(x+3)=0 x=3; x=-3
Ответ x=2, x=-2 и x=3, x=-3
t²-34t+225=0
D=1156-900=2566
√256=16
t= 34-16/2=9
t= 34+16/2=25
x²=9 x=3 x=-3
x²=25 x=5 x=-5
t²-20t+64=0
D=400-256=144
√144=12
t=20-12/2=4
t= 20+12/2=16
x²=4 x=2 x=-2
x²=16 x=4 x=-4
t²-20t+100=0
D=400-400=0
t=20/2=10
x²=10
x=√10