ACESTE EX. SE BAZEAZĂ PE REGULA LUI ,, ⁻ " AFLAT ÎN FAŢA UNEI PARANTEZE!
1. ( 3x²₋ 2x₊1) ₋ (₋x²₊4x₋5)= 2. (4x³₋12x²+5x- 7) - (3x³-8x²+2x+4)=
3x²₋ 2x₊1+ x²- 4x+5= 4x³₋12x²+5x- 7 - 3x³+ 8x²- 2x- 4=
4x²- 6x+ 6 3x³- 4x²+ 3x- 11
3. 20x²₋ (₋5x²₊ 4x₋ 18)₋ ( 6₋3x)₋ (2x²₊ 6x₋11)=
20x²+ 5x² - 4x+ 18 - 6 +3x₋ 2x² - 6x+11=
23x² ₋ 7x +23
4. 7x+( -3x+ 2y)- 5x+( 10x- 2y)=
7x -3x+ 2y- 5x+ 10x- 2y=
14x
5.(- 4a+3b-10c)- (11- 2a- 4b)+ (6a+ 14c- 20b)=
- 4a+3b-10c- 11+ 2a+ 4b+ 6a+ 14c- 20b=
4a -13b+ 4c -11
6.(m+ n+ p) -(m- n-p)+( -m-n+ p)- 3p=
m+ n+ p- m+ n+ p- m- n+ p- 3p=
-m+ n sau n- m
