Question

dau 20 punte!!!+coroana
va rog ajutati-ma!
25×[3+2×(2X-5)]=525
X=???

Answer 1

25 * [3 + 2*(2x-5)] = 525 |:25 (impartim la 25)

3 +2*(2x-5) = 21 |-3 (scadem 3)

2*(2x-5) = 18  |:2 (impartim la 2)

2x-5 = 9 |+5 (adunam 5)

2x = 14 |:2 (impartim la 2)

x = 7

Answer 2

25×[3+2×(2 X-5)]=525
3 + 2 × ( 2 x - 5 ) = 525 : 25
3 + 2 × ( 2 x - 5 ) = 21
2 × ( 2 x - 5) = 21 - 3
2 × ( 2 x - 5)= 18 
2 x - 5 = 18 : 2 
2 x - 5 = 9 
2 x = 9 + 5 
2 x = 14
x = 14 : 2
x = 7