Question

sa seb determine x E N astfel incat fractia : 4+x supra 6+x sa fie egala cu : 9 supra 11, 4 supra6, 7 supra 9, 103 supra 105. Vărog e urgent dau coroana+ puncte!

Answer 1

4+x/6+x=9/11=>(4+x)•11=(6+x)•9<=>44+11x=54+9x<=>
11x-9x=54-44=>2x=10=>x=2
4+x/6+x=4/6=>(4+x)•6=(6+x)•4=>6x-4x=0=>x=0

4+x/6+x=7/9=>(4+x)•9=(6+x)•7=>9x-7x=42-36=>2x=6=>x=3

4+x/6+x=103/105=>(4+x)•105=(6+x)•103=>105x-103x=
=618-420=>2x=198=>x=99