7x - 8 = 713
7x = 173 + 8
7x = 181
x = 181 : 7
x = 181/7
4x : 17 = 0
4x = 0
x = 0
=.= hok tốt!!
A, 7x - 8 = 713
7x = 713 + 8
7x = 721
x = 721 : 7
x= 103
B, 4x : 17 = 0
4x = 0 . 17
4x = 0
x = 0 . 4
x = 0
à,sorry bn ,mk lm nhầm phần a
7x - 8 = 713
7x = 713 + 8
7x = 721
x = 103
7x-8=713
\(\Leftrightarrow\)7x=721
\(\Leftrightarrow\)x=103
4x:17=0
\(\Leftrightarrow\)4x=0
\(\Leftrightarrow\)x=0
Học tốt!
A. 7x - 8 = 713
=> 7x = 713 + 8
=> 7x = 721
=> x = 721 : 7
=> x = 103
A. 7x - 8 = 713
=> 7x = 713 + 8
=> 7x = 721
=> x = 721 : 7
=> x = 103
Vậy x = 103
B. 4x : 17 = 0
=> 4x = 0 + 17
=> 4x = 17
=> x = 17 : 4
=> x = vô lý
\(7x-8=713\)
\(7x=713+8\)
\(7x=721\)
\(x=721:7\)
\(x=103\)
\(4x:17=0\)
\(4x=17\cdot0\)
\(4x=0\)
\(x=0\)
a. 7x - 8 = 713
=>7x = 721
=>x = 103
b. 4x : 17 =0
=> 4x = 0
=> x =0