Question

Dau steluțe !calculați :
a) 11m +(3n-5m+6)-(4m-2n-8)=
b)(12m²-5m+n²)-(2n²+6m-3m²)-(12m²-mn)=
C) -10,5a²+(a²-0,1a²-0,9a²)+2,35a²+1,65a²=
d) ( x-5)(3x²+x+1)+(x²-1)(-3x+16)

Answer 1

a) 11m +(3n-5m+6)-(4m-2n-8)=11m +3n-5m+6-4m+2n+8=2m+5n+14
b) (12m²-5m+n²)-(2n²+6m-3m²)-(12m²-mn)=12m²-5m+n²-2n²-6m+3m²-12m²+mn=3m²-1n²-11m+mn
c) -10,5a²+(a²-0,1a²-0,9a²)+2,35a²+1,65a²= -10,5a²+a²-0,1a²-0,9a²+2,35a²+1,65a² = -6.5a²
d) (x-5)(3x²+x+1)+(x²-1)(-3x+16)=3x^3+x^2+x-15x^2-5x-5-3x^3+16x^2+3x-16=2x^2-x-21

Sper ca nu am facut nici o greseala la calcule.