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află numărul necunoscut:
x:2+(105-275:11):4=28


Răspuns :

x:2+(105-275:11):4=28
x : 2 + (105 - 25) : 4 = 28
x : 2 + 80 : 4 = 28
x : 2 + 20 = 28
x : 2 = 28 - 20
x : 2 = 8
x = 8 × 2
x = 16
x:2+(105-275:11):4=28
x:2+(105-25):4=28
x:2+80:4=28
x:2+20=28
x:2=8
x=16