172x2 - 79:933 = 2-3
172x2 - 42,875 = 0,125
172x2 = 0,125 + 42,875
172x2 = 43
x2 = 172 : 43
x2 = 4
x = \(\sqrt{4}\) = 2 ( 22 = 4 )
Vậy x = 2
172x^2 - 7^9 : 98^3 = 2^-3
172x^2 - 7^9 : 98^3 = 1/8
172x^2 - 7^9 : ( 7^3 ) ^ 3 = 1/8
172x^2 - 7^ 9 : 7^9 = 1/8
172x^2 - 1 = 1/8
Nguyen ngoc dat yêu cầu là tính x chứ không phải tính 172x2-1 nhé
ta có : 172x2 - (73)3 : 983 = 2-3 \(\Leftrightarrow172x^2-343^3:98^3=2^{-3}\)\(\Leftrightarrow172x^2-\left(\frac{7}{2}\right)^3=2^{-3}\)
\(\Leftrightarrow172x^2=2^{-3}+\left(\frac{7}{2}\right)^3\)\(\Leftrightarrow172x^2=43\)\(\Leftrightarrow x^2=43:172\)\(\Leftrightarrow x^2=\frac{1}{4}\)\(\Leftrightarrow x=\sqrt{\frac{1}{4}}\)
\(\Leftrightarrow x=\frac{1}{2}\)