+ 3n -
=
+3n +
=
=
=
=
<span>если m=12, n= -3, то
</span>
=
=
= -
= -2
1. 1/(6х-4у)-1/(6х+4у)-3х/(4у²-9х)=1/2(3х-2у)- 1/2(3х+2у)+ 3х/(3х-2у)(3х+2у)=числитель 3х+2у-(3х-2у)+6х/знаменатель 2(3х-2у)(3х+2у)=числитель 3х+2у-3х+2у+6х/ знамен 2(3х-2у)(3х+2у)=числитель 2(3х+2у)/знам 2(3х-2у)(3х+2у)=1/(3х-2у)............
)))))))))]))))))))---------------
2x²-9x-5=0
D = b²-4ac
D = (-9)² - 4 · 2 · (-5) = 81+40 = 121
√D=√121=11
<span />x1=-b+√D\2a
x1 = 9+11\4 = 20\4 = <span>5
</span><span />x2=-b-√D\2a
x2 = 9-11\4 = -2\4 = -1\2 = -0,5
<u>Ответ: x1 = 5; x2 =-0,5</u>