1)12 * 4 = 48
2) 12 -1 =11
3) 4 + 2 = 6
4) 6 * 11 =66
5) 66 - 48 = на 18 м стало больше площадь
ты написал число значит число 123 456 789 - делится на 3 и 9 (41 152 263) и (13 717 421)
Решение
<span>(4x+3)(4x-3)-(6x-1)^2+18=0
</span><span>16x</span><span>² - 9 - 36x</span><span>² + 12x - 1 + 18 = 0
</span><span>- 20x</span><span>² + 12x + 8 = 0
</span><span>4x</span><span>² - 6x - 4 = 0
</span><span>2x² - 3x - 2 = 0
</span><span>D = 9 + 4*2*2 = 25
</span><span>x₁ = (3 - 5)/4
</span><span>x₁ = -1/2
</span><span>x₂ = (</span><span> 3 + 5)/4
</span><span>x</span><span>₂ </span><span>= 2
</span><span>Ответ: </span><span>x₁ = -1/2 ; </span><span>x₂ </span><span>= 2</span>
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1) 19/27-(х+10/27)=2/27
19/27-х-10/27=2/27
1/3-х=2/27
-х=2/27-1/3
-х=-7/27
х=7/27
2) (19/15-11/15)+х=8/15
8/15+х=8/15
х=8/15-8/15
х=0
3) 5/9+х=8/9-1/9
5/9+х=7/9
х=7/9-5/9
х=2/9