Question

Tìm x, biết:

1) 707 - 3 . ( x + 3⁴ ) = 407

Answer 1

Giải:

\(707-3\left(x+3^4\right)=407\)

\(\Leftrightarrow3\left(x+3^4\right)=300\)

\(\Leftrightarrow x+3^4=100\)

\(\Leftrightarrow x+81=100\)

\(\Leftrightarrow x=100-81=19\)

Vậy \(x=19\).

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Answer 2

707 - 3 . ( x + 3⁴ ) = 407

707 - 3 . ( x + 81 ) = 407

3 . (x + 81) = 707 - 407

3 . (x + 81) = 300

x + 81 = 300 : 3

x + 81 = 100

x = 100 - 81

x = 9.