<span>4х-6у=26</span>
<span>5х+3у=1 </span>
У(х)= 8/(х-4)
х-4 не=0
х не= 4
х∈ (-∞,4)∪(4,+∞)
У(0)= 2*0+5*0-3= -3
У(1)= 2*1+5*1-3= 4
У(-3)= 2*(-3)^2+5*(-3)-3= 18-15-3=0
У(1/2)= 2*(1/2)^2+5*1/2-3= 1/2+5/2-3= 3-3=0
a15=a1+14d
22=a1+14
a1=8
S9=2a1+8d/2 *9=16+8/2*9=12*9=108