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afla nr necunoscut :
125-(7×9+3×9) :a -(10×10+5)=8×5:4=


Răspuns :

125-(7×9+3×9) :a -(10×10+5)=8×5:4
125-(63+27) : a -(100+5) = 40:4
125-90: a- 105 = 10
20-90 : a = 10
90: a = 20-10
90 : a = 10
a = 90 : 10
a = 9