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stiind ca 3asupra 5b=0,5 calculati 2a+3b supra8a-4b

Răspuns :

Albatran
0,68a/b=0,5
a/b=0,5/0,6=5/6
b/a=6/5
b/a=1,2
b=1,2a

2a+3b= 2a+3*1,2 a=2a+3,6a=5,6 a
8a-4b=8a-4*1,2a=8a-4,8a=3,2a
 5,6a/3,2a=5,6/3,2=56/32=7/4

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