Răspuns :
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30=55-15 sau 40-10=30
50=67-17 sau 70-20=50
40=78-38 sau 90-50=40
10=94-84 sau 30-20=10
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70-50=20
70-20=50
70-30=40
70-40=30
30=55-15 sau 40-10=30
50=67-17 sau 70-20=50
40=78-38 sau 90-50=40
10=94-84 sau 30-20=10
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¤
70-50=20
70-20=50
70-30=40
70-40=30