O ciągu arytmetycznym (an) wiadomo, że a4=6, a7= 21. Ile wynosi różnica
a₇=a₄+3r
21=6+3r
3r=21-6
3r=15
r=15;3
r=5= róznica ciagu
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a₇=a₄+3r
21=6+3r
3r=21-6
3r=15
r=15;3
r=5= róznica ciagu