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descopera regula si completeaza fiecare sir :

400,650,900..... , ..... , ..... .

9 000,8 300,7 600........ , ...... , ....... . ...... , ....... , 2 600 ,3800, 5 000........ , ..... , ....... .

Răspuns :

Chris02Junior
progresie aritmetica, primul termen 400, ratia 250: 400,650,900,1150,1400,1650,1900,2150,2400,2650,2900,.....
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progresie aritmetica, ratia= -700: 9000,8300,7600,6900,6200,5500,4800,4100,3400,.....
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la fel, ratia 1200: 2600,3800,5000,6200,7400,8600,9800,11000,12200,...
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Succes in continuare!

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