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100 – [250 - 5x(x-5):5]× 3 = 40 X=? va roooooog !!!!​

Răspuns :

100 – [ 250 - 5 x ( X - 5 ) : 5 ] × 3 = 40

[ 250 - 5 x ( X - 5 ) : 5 ] × 3 = 100 - 40 = 60

250 - 5 x ( X - 5 ) : 5= 60 : 3 = 20

5 x ( X - 5 ) : 5 = 250 - 20 = 230

5 x ( X - 5 ) = 230 x 5

X - 5 = 230 x 5 : 5 = 230

X = 230 + 5 = 235