Bài làm
a) 7x - 13 = 32 . 4
=> 7x - 13 = 9 . 4
=> 7x - 13 = 36
=> 7x = 36 + 13
=> 7x = 49
=> x = 49 : 7
=> x = 7
Vậy x = 7
# Học tốt #
7x - 13 = 32.4
7x - 13 = 9.4
7x - 14 = 36
7x = 36 + 14
7x = 49
x = 49 : 7
x = 7
\(7x-13=3^2.4\)
\(7x-13=36\)
\(7x=36+13\)
\(7x=49\)
\(x=49:7\)
\(x=7\)
7x-13=3^2.4
7x-13=9.4
7x-13=36
7x=36+13
7x=49
x=49:7
x=7
7x-13=9.4
7x-13=36
7x=36+13
7x=49
x=49:7
x=7
Vậy x=7