X1+x2=7,x1*x2=2
a)x1x2²+x1²x2=x1*x2*(x2+x1)=2*7=14
б)x1²+x2²=(x1+x2)²-2x1*x2=49-4=45
в)x1²*x2^4+x1^4*x2²=(x1*x2)²*(x2²+x1²)=4*45=180
г)x1³+x2³=(x1+x2)*(x1²-x1*x2+x2²)=7*(14-2)=7*12=84
д)x1³*x2^6+x1^6*x2³=(x1*x2)³(x2³+x1³)=8*84=672
е)x1^4+x2^4=(x1²+x2²)²-2(x1*x2)²=45²-2*2²=2025-8=2017