А) 4а²+30ав+ * =(2а)²+2*2а*7,5в+(7,5в)²=4а²+30ав+56,25в²
б) * -24х²у²+4у⁴=*-2*2у² * 6х²+(2у²)²=(6х²)² - 24х²у²+4у⁴=36х⁴-24х²у²+4у⁴
в) х²+144у²+* =(х)² + (12у)²+2*х*12у=х²+144у²+24ху
г) *-6ху+*=* - 2*3х*у+* =(3х)²-6ху+(у)²=9х²-6ху+у²
*-6ху+* = *-2*х*3у+*=х²-6ху+(3у)²=х²-6ху+9у²