Вычислить (1 :

<span>(1 : 6/11 - 2  3/4 * 0,5) * 4  4/11=</span>(1*11/6 - 11/4 * 0,5) * 48<span>/11=
</span>=(11/6 - 11/8) * 48/11=(44/24 - 33/24) * 48<span>/11=11/24*48/11=48/24=2
</span>
<span>x^2+2x-3=0
</span>D = b² - 4ac = 22<span> - 4·1·(-3) = 4 + 12 = 16
</span>x1 = (<span><span>-2 - √16)/(</span>2·1)</span> = (<span>-2 - 4)/2</span> = <span>-6/2</span><span> = -3
</span>x2 = (<span>-2 + √16)/(2·1)</span> = (-2 + 4)/2 = 2/2<span> = 1</span>