Question

Calculaţi: a) (3x + 4x-2x): x; b) [5 (3x + 7x) - 3 (5x +4x)]: 23 + 2x; c) 21x - {3x + [2x + (4x + 2x) 3]:5}:7. ​

Answer 1

Răspuns:

(3x + 4x-2x): x=5x/x=5

[5 (3x + 7x) - 3 (5x +4x)]: 23 + 2x=

(5·10x-3·9x):23+2x=

(50x-27x):23+2x=

23x/23+2x=

x+2x=

3x

21x - {3x + [2x + (4x + 2x) 3]:5}:7=

21x-[3x+(2x+18x):5]:7=

21x-(3x+20x:5):7=

21x-(3x+4x):7=

21x-(7x:7)=

21x-x=

20x