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20=240\600+Z ×100


Cat este Z???

Va roog!!!!


Răspuns :

20=240/600+z ×100
20=0,4+ 100z
100z=20-0,4
100z=19,6
z=19,6/100
z=0,196
sau
20=240/600+z ×100
20=24/60+ 100z
20=4/10+ 100z
200=4+1000z
1000z=200-4
1000z=196
z=196/1000
z=49/250