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Continuati sirurile ; a) 855,1005,1155,____,____,____; b) 10000,9200,8400,____,____,____; c) ____,____,3000,4500,6000,____,____; d) ____,____,5000,3750,2500,____,____;

Răspuns :

855,1005,1155,1305,1455,1605
Eu zic asa:la prima din 150 din 150 in plus,la adoua 800 din 800 in minus,la atreia 1500 din 1500 in plus si minus,si la apatra 1250 in plusi si minus.