Question

x+2x+3x+...+18x=1368.Giup minh voi

Answer 1

ta có:

x+2x+3x+...+18x=1368

(1+2+3+...+18)x=1368

x=1368:(1+2+3...+18)

x=1368:171

x=8

Answer 2

=> x(1+2+3+...+18)=1368

=> 171x = 1368

=> x = 8

Answer 3

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