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Problema 6 ,7,8,9 pls urgent (rezolavAre de cls a 4 a

Problema 6 789 Pls Urgent RezolavAre De Cls A 4 A class=

Răspuns :

D=5*S
S=D-100
D=5*(D-100)
D=5D-500
500=4D
D=500:4
D=125
S=125-100
S=25