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ex. 1 ) (8x5+6x9 +X) :9 +312= 323
ex.2 ) 100-{ 250-5x( X-5) :5} x3=40


Răspuns :

ex. 1 )

(8x5+6x9 +X) :9 +312= 323

(40+54 +X) :9=323-312

(94 +X) :9=11

94 +X=11×9

94 +X=99

X=99-94

X=5



ex.2 )

100-{ 250-5x( X-5) :5} x3=40

{ 250-5x( X-5) :5} x3=100-40

{ 250-5x( X-5) :5} x3=60

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

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

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

5x( X-5) :5=230

5x( X-5)=230×5

5x( X-5)=1 150

X-5=1 150:5

X-5=230

X=230+5

X=235






(40+54+X)÷9+312=323
(94+X)÷9=323-312=11
94+X=11×9=99
X=99-94=5