√ -56 - 15 Х= -Х
(√ -56-15х)² =( -Х)²
-56 -15х =Х ²
-Х ²-15х-56=0
Х²+15х+56=0
Д=√1=1
Х1=( -15+1):2= -7
Х2= ( -15 -1):2= -8
1) y=0.7*(-1.5)-1= -2.05
2) y=0.7*0-1=-1
3) y=0.7*1.5-1=1.05-1=0.05
4) 0=0.7x-1⇒x=10/7
5) 2=0.7x-1
3=0.7x⇒x=30/7
5) 1000=0.7x-1
1001=0.7x⇒x=1001/0.7
1) 12ab-5a-ab-6a=11ab-11a
2) 15x^3-10x^2-20x
(5А²-2А-3)-(2А²+2А-5)=
=5А²-2А-3-2А²-2А+5=
=3А²-4А+2