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4. Află necunoscuta:
a + 456 x 34 = 23.667
123 x 100 - a = 85 x 45
a - 455 x 13 = 12.470​


Răspuns :

a) a+456×34=23.667

a+15.504=23.667

a= 23.667-15.504

a= 8.163

b) 123×100-a=85×45

12300-a=3.825

a= 12300-3825

a=8.475

c) a-455×13=12.470

a-5.915=12.470

a= 12.470+5.915

a= 18.385

Răspuns:

a+15,504=23,667

a=23,667-15,504

a=8,163

..12,3-a=3,825

-a=3,825-12,3

-a=-8,49

a=8,49

a-5,915=12,470

a=12,470-5,915

a=6,555