X=4-y;_______
(4-y)/2=y/3;_______
2y=3(4-y);_______
2y=12-3y;_______
5y=12;_______
y=12/5=2,4(две целых две пятых)________
X=4-2,4=1.6 (одна целая три пятых)
<span>5x^2+bx+140=0
D=b^2-4*5*140=b^2-20*140=b^2-2800
b^2-2800>=0
b^2>=2800
b^2=2800
b1= -20sqrt(7)
b2=20sqrt(7)
b∈(-∞; -20*корень(7)]⋃[20*корень(7); +∞)
x1= (-b+sqrt(</span>b^2-2800))/10
x2= (-b-sqrt(b^2-2800))/10
<span>
7=</span> (-b+sqrt(b^2-2800))/10
70=(-b+sqrt(b^2-2800))
<span>(b+70)^2=b^2-2800
b^2+140b+4900=b^2-2800
140b= -2800-4900
14b= -280-490
7b= -140-245
7b= -385
b= -55
x2= (55-sqrt(55^2-2800))/10= </span>(55-sqrt(225))/10=(55-15)/10=4
X^2+3x=361-57
x^2+3x-304=0
D=9+1216=1225
√D=35
x1=(-3+35)/2=16
x2=(-3-35)/2= -19
<span> 6p+14p^2=2р*(3+7р)
Просто выносом 2р за скобки)
</span>