$(2x-1)^3=75$$⇒ (2x-1)^3=4,21^3$$⇒ 2x-1=4,21$$⇒ 2x=5,21$$⇒ x≈ 2.605$
Đáp án:
x≈2,61
Giải thích các bước giải:
(2x-1)³=75
(2x-1)³≈4,21³
⇒2x-1≈4,21
⇒2x=5,21
⇒x= 5,21 :2
⇒x≈2,61
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