Question

[15 x (10a-11)-120] x 10-125=25
100 x {10 x [(45a-35):5+12] x 2-21}+17=25917
Rezolvati ecuatiile! Va rog frumos!!

Answer 1

[ 15 * ( 10a - 11 ) - 120 ] * 10 = 150
15 * ( 10a - 11 ) - 120 = 15
15 * ( 10a - 11 ) = 135
10a - 11 = 9
10a = 20
a = 2

100 * { 10 * [ ( 45a - 35 ) : 5 + 12 ] * 2 - 21 } + 17 = 25917
100 * { 10 * [ ( 45a - 35 ) : 5 + 12 ] * 2 - 21 } = 25900
10 * [ ( 45a - 35 ) : 5 + 12 ] * 2 - 21 = 259
10 * [ ( 45a - 35 ) : 5 + 12 ] * 2 = 280
[ ( 45a - 35 ) : 5 + 12 ] * 2 = 28
( 45a - 35 ) : 5 + 12 = 14
( 45a - 35 ) : 5 = 2
45a - 35 = 10
45a = 45
a = 45 / 45
a = 1