750 - (а * 80 + 240) : 9 = 590
(а * 80 + 240) : 9=750-590
(а * 80 + 240) : 9=160
а * 80 + 240=160*9
а * 80 + 240=1440
а * 80 =1440-240
а * 80 =1200
a=1200:80
a=15
1)910:35=26
2)624:48=13
3)42•49+50=2108
<span>1*(23-4)*5 = 95
надеюсь правильно !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!</span>
<span>5<span>x^2</span>+2x−3=</span><span>5</span><span>(x^2+2/5*x−3/5)</span><span>=</span><span>5</span><span>(x^2+1x−3/5*x−3/5⋅1)</span><span>=</span><span>5</span><span>(x(x+1)−3/5*(x+1))</span><span>=</span><span>5</span><span>(x−3/5)</span><span>(x+1)</span>Ответ: <span><span>5<span>x^2</span>+2x−3=5<span>(x−<span>3/5</span>)</span><span>(x+1)</span></span></span>