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afla nr.necunoscut (10×10+100÷10-10×a)=10​

Răspuns :

( 10 × 10 + 100 : 10 - 10 × a ) = 10

( 100 + 10 - 10 × a ) = 10

( 110 - 10 × a ) = 10

10 × a = 110 - 10

10 × a = 100

a = 100 : 10

a = 10

(100+10-10a)=10

110-10a=10

10a=110-10

10a=100

a=100:10

a=10