V 15 * V 135 - V 2 * V 242 = V 2025 - V 484 = 45 - 22 = 23
1 - 1
2 - 3
3. х = 5 - 8у
у = (5-х)/8
4. 6*2 - а*5 = -3а
12 - 5а = -3а
2а = 12
а = 6
(9a+3a^2-3a-a^2)+(1-2a+a^2)=4a+3a^2+1=2+0.75+1=3.75
3x²+12x+4x+12=0
3x²+16x+12=0
D=256-12*4*3=256-144=112
x1=(-16+4√7)÷6=(-8+2√7)÷3
x2=(-16-4√7)÷6=(-8-2√7)÷3
<span>2√5-√45+√80= </span>2√5-3√5+4√5=3<span>√5</span>