Question

Desfaceti parantezele si reduceti termenii asemenea:

a) 12- (x - 2y) - (1- x) + (2 - y) – 10

b) 2x3 + 4x – 7 – (x3 + 4x – 1);

c) 3x3 + 2x – 7 – (2x3 + 2x – 1);

Answer 1

a) 12- (x - 2y) - (1- x) + (2 - y) – 10 =12-x+2y-1+x+2-y-10=3+2y;

b) 2x³ + 4x – 7 – (x³ + 4x – 1)=2x³+4x-7-x³-4x+1=x³-6;

c) 3x³ + 2x – 7 – (2x³ + 2x – 1)=3x³+2x-7-2x³-2x+1=x³-6;

Bafta!

Answer 2

a)12-(x-2y)-(1-x)+(2-y)-10=

12-(x-2y)-(1-x)+2-y-10=

12-x+2y-1+x+2-y-10=

(12-1+2-10)+(-x+x)+(2y-y)=3y


b)2x³+4x-7-(x³+4x-1)=

2x³+4x-7-x³-4x+1=

(2x³-x³)+(4x-4x)+(-7+1)=x³-6


c)3x³+2x-7-(2x³+2x-1)=

3x³+2x-7-2x³+2x-1=

(3x³-2x³)+(2x-2x)+(-7+1)=x³-6