theo bài ra ta có:
2A-20+6A=3A+A
=>8A+20=4a
=>8A-4A=-20
=>4A=-20
=>A=-5
^_^
theo bài ra ta có:
2A-20+6A=3A+A
=>8A+20=4a
=>8A-4A=-20
=>4A=-20
=>A=-5
^_^
theo bài ra ta có:
2A-20+6A=3A+A
=>8A+20=4a
=>8A-4A=-20
=>4A=-20
=>A=-5
^_^
theo bài ra ta có:
2A-20+6A=3A+A
=>8A+20=4a
=>8A-4A=-20
=>4A=-20
=>A=-5
^_^
theo bài ra ta có:
2A-20+6A=3A+A
=>8A+20=4a
=>8A-4A=-20
=>4A=-20
=>A=-5
^_^