Question

С 3-6
4,3,6 письменно

Answer 1

3)

$\frac{ \sqrt{0.2} \times \sqrt{4.8} }{ \sqrt{6} } = \frac{ \sqrt{0.2} \times \sqrt{6} \times \sqrt{0.8} }{ \sqrt{6} } = \sqrt{0.2} \times \sqrt{0.8} = \sqrt{0.16} = 0.4$

4)

$(x + 16)^{2} + {(x - 20)}^{2} = 2 {x}^{2} \\ {x}^{2} + 32x + 256 + {x}^{2} - 40x + 400 = 2x^{2} \\ - 8x = - 656 \\ x = 82$

6)d=9-2=7

a10=2+7(10-1)=2+7*9=65

S10=10(2+65)/2=335