\(7x-x=5^{21}:5^{19}+3.2^2-7^0\)
\(6x=5^2+3.2-1\)
\(6x=25+12-1\)
\(6x=36\)
\(x=6\)
K bt đk:))
Ta có :
7x - x = 521 : 519 . 3 . 22 - 70
=> 6x = 521: 519 + 3 . 22 - 70
=> 6x = 52 + 3. 4 - 1
=> 6x = 25 + 3 . 2 - 1
=> 6x = 25 + 6 - 1
=> 6x = 30
=> x = 30 : 6
=> x = 5
7x−x=521:519+3.22−70
6x=52+3.2−16x=52+3.2−1
6x=25+12−16x=25+12−1
6x=366x=36
x=6
7x - x = 36
7.x - 1.x = 36
x . (7-1) = 36
x . 6 = 36
x = 36 : 6
x = 6