Question

Buna ma puteti ajuta si pe mine la urmatoarele exercitii??
1) 5a+3a6a
2) -5b+3b-2b+(7b-b+2b)-b
3) (-5a²+3ab)+(b²-2ab)-(a²+3b²-4ab)+(a²-b²)
4) 7√2+11√2x+12√2x-5√2x
5) 15a-13a+....=20a
6)12x+4x-....=10x
7) (2a+3y)-(4x+5y)-(10-4y)
8) (3x²-7xy)-(xy+5y²)-(x²-y²)
9)6x-(3xy+3x-4x²)-3x+x²+4xy
10) (4√2-2√2)x+(6√2-3√2)x-(8√2-√2)x+3√2x
11) (2√28+√63)xy-√50xy+(√8+√18)xy+√175
Este foarte urgent!!!

Answer 1

1) 5a+3a+6a=14a
2) -5b+3b-2b+(7b-b+2b)-b = -4b+8b-b =3b
3) (-5a²+3ab)+(b²-2ab)-(a²+3b²-4ab)+(a²-b²) =-5a²+3ab+b²-2ab-a²-3b²+4ab+a²-b² =
=-5a²-3b²+5ab
4) 7√2+11√2x+12√2x-5√2x =7√2+18√2x    
 7√2x+11√2x+12√2x-5√2x =25√2x        aici am adaugat un x la primul termen 
5) 15a-13a+18a=20a 
6)12x+4x-6x=10x
7) (2x+3y)-(4x+5y)-(10-4y) =2x+3y-4x-5y-10+4y = 2x+3y-4x-5y-10+4y =-2x+2y-10  aici in loc de 2a  am pus 2x  
8) (3x²-7xy)-(xy+5y²)-(x²-y²)= 3x²-7xy-xy-5y²-x²+y²=2x²-8xy+4y²
9)6x-(3xy+3x-4x²)-3x+x²+4xy=6x-3xy-3x+4x²-3x+x²+4xy=
=5x² +xy 
10) (4√2-2√2)x+(6√2-3√2)x-(8√2-√2)x+3√2x=
=2x√2+3x√2-6x√2+3√2x=2√2x
11) (2√28+√63)xy-√50xy+(√8+√18)xy+√175= 
=(4√7+3√7)xy-5√2xy+(2√2+3√2)xy+5√7=
=10xy√7-5xy√2+5xy√2+5√7=10xy√7-5xy√2+5xy√2+5√7=
=10xy√7+5√7