7 log(7)⁷√7 = 7log(7) 7^(1/7) = 7/7 log(7)7 = 7/7 = 1
220*х<301600
x<301600/220
x<1370.(90)
(x - y)² + (x + y)² = x² - 2xy + y² + x² + 2xy + y² = 2x² + 2y² = 2(x² + y²)
1) = с²-3с+2с-6-с²-3с+с+3= -3с-3
2) = p²-11p+4p-44+р²+12р+36=2р²+5р-8
3)= 3(х²-10х+25)-8х²+10х= 3х²-30х+75-8х²+10х= -5х²-20х+75
4)= 7(4у²-20у+25)-2(49у²-14у+1)=28у²-140у+175-98у²+28у-2=70у²-112у+173