Question

(5,7^2-2,1ab+b^2)-(3,9ab-0,3a^2+2b^2),если а=-1,b=5

Answer 1

5,7^2-2.1ab+b^2-3.9ab+0.3a^2-2b^2=5.7^2+0.3a^2-6ab-b^2=3.49+0.3+30-25=37.79