№1
18x+6y/7xy-4x-15y/7xy
№2
14p^4/11p^3*22p^2/63p^2
№3
5x^2+7(x-2)=4x^2-14
№4
5x+8 меньше или рано 4x-12
СРОЧНО

пересчитала #1

1.18x+6y/7xy - 4x-15y/7xy= 18х+6у-4х+15у / 7ху=14х+21у/ 7ху= 7(2х+3у) / 7ху=2х+3у /ху 2.14p^4/11p^3 * 22p^2/63p^2=2p^4/ p^3 * 2p^2/9p^2=4p^4+2 /9p^3+2=4/9* р^6-5= 4/9 р3.5x²+7(x-2)=4x²-145x²+7x-14-4x²+14=0х²+7х=0х(х+7)=0х1=0х+7=0х2=-74.5x+8 ≤ 4x-125x-4х ≤ -12-8х ≤ -20