Question

Efectuati: (2x²+4xy)+(y²-2xy)-(x²+4y²-5xy)+(x²-y²)=
b) 11m+(3n-5m+6)-(4m-2n-8)=
c) (12m²-5m+n²)-(2n²+6m-3m²)-(12m²-mn)=

Answer 1

a)(2x²+4xy)+(y²-2xy)-(x²+4y²-5xy)+(x²-y²)=
2x²+4xy+y²-2xy-x²-4y²+5xy+x²-y²=
2x²+7xy

b)11m+(3n-5m+6)-(4m-2n-8)=
11m+3n-5m+6-4m+2n+8=
2m+5n+14

c) (12m²-5m+n²)-(2n²+6m-3m²)-(12m²-mn)=
 12m²-5m+n²-2n²-6m+3m²-12m²+mn=
3m²-n²-11m+mn