Răspuns:
Explicație pas cu pas:
a×9+7×5-3×9=80
a x 9 + 35 - 27 = 80
a x 9 = 80 - 35 + 27
a x 9 = 72
a = 72 : 9
a = 8
175+7×0-b:9=166
175 + 0 - b : 9 = 166
175 - b : 9 = 166
b : 9 = 175 - 166
b : 9 = 9
b = 9 x 9
b = 81
(901-859):9-3×2=1 Verifica enuntul , cred ca e ceva gresit la el .
28:b×9-6×10=3
28 : b x 9 - 60 = 3
28 : b x 9 = 3 + 60
28 : b x 9 = 63
28 : b = 63 : 9
28 : b = 7
b = 28 : 7
b = 4
(100 - 10 × 9 ) : b × 5 = 10
( 100 - 90 ) : b x 5 = 10
10 : b x 5 = 10
10 : b = 10 : 5
10 : b = 2
b = 10 : 2
b = 5
