Question

Упростиь выражение?
3n(n-2)-4n(2n+3)+5n(n+2) при=-2,5

Answer 1

3n(n-2)-4n(2n+3)+5n(n+2)=3n^2-6n-8n^2-12n+5n^2+10n=-8n=-8*(-2,5)=20