Răspuns :
21-4*(16:a-9)=5
17*(16:a-9)=5
17*(16a-9)=5
16a-9=17:5
16a-9=3,4
16a=3,4-9
16a=34supra100 -9
16a=25 supra 100
a=25supra100 :16
a=1,56supra 100
a=156
succes!
17*(16:a-9)=5
17*(16a-9)=5
16a-9=17:5
16a-9=3,4
16a=3,4-9
16a=34supra100 -9
16a=25 supra 100
a=25supra100 :16
a=1,56supra 100
a=156
succes!