Ответ: a) 65
Объяснение:
b10 = b9 + d
b11 = b9 + 2d
90 = 40 +2d
50 = 2d
d = 25
b10 = 40 + 25 = 65
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Ответ: a) 65
Объяснение:
b10 = b9 + d
b11 = b9 + 2d
90 = 40 +2d
50 = 2d
d = 25
b10 = 40 + 25 = 65