Объяснение:
81x2 = 49
х2 = 49/81
x = +- 7/9
Ответ:
(9х-7)(9х+7)=0
9х=7 9х=-7
х=7/9 х=-7/9
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Объяснение:
81x2 = 49
х2 = 49/81
x = +- 7/9
Ответ:
(9х-7)(9х+7)=0
9х=7 9х=-7
х=7/9 х=-7/9