1
(25b²+7a-15b²)/b=(10b²+7a)/b=(40+154)/(-2)=-194/2=-97
2
(3*576-4*36)/(-24*6)=-(1728-132)/48=-1590/48=-33,125
3
4a²-20a=25+20a-10a²=-6a²+25=-6*4/25+25=601/25=24,04
4
16-24a+9a²-7a²+24a=2a²+16=2*9/16+16=17,125
5
12a²+12ab+3b²-10ab=12a²+2ab+3b²=264+2√66+9=273+2√66