vi M thuoc AB => M nam giua A,B
a, ta có : MA+MB=AB
=> MAx2=22
=> MA=11(cm)
MB=11(cm)
b, ta có : MA-MB=9
=> MA= MB+9
ta co : => MA+MB=AB
=> MB+9+MB=AB
=> MBx2+9=22
=>MB=6,5(cm);MA=15,5(cm)
c, ta co : 5MA=6MB
=> MA=6MB/5
ta co : MA+MB=AB
=> 6MB/5+MB=ab
=> 11MB/5=22
=> MB=10;MA=12(cm)
tick nha