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Aflați x
x supra 6= 4 supra 5
2,3x =2 supra 7
7 supra x =2 supra 5
21x supra 7 = 13 supra 12
Va rog repede!!


Răspuns :

x/6=4/5⇒5x=24⇒x=24/5⇒x=4.8
2.3x=2/7⇒7×2.3x)=2⇒16.1x=2⇒x=2/16.1⇒x=0.124
7/x=2/5⇒2x=35⇒x=35/2⇒x=17.5
21x/7=13/12⇒12(21x)=17×13⇒252x=221⇒x=221/252⇒x=1.135
sucees