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Aflati un nr rational stiind ca 3/5 din el este: a)60 b)3/8 c)5250. Dau coroană​

Răspuns :

a) 3/5×a=60

3a/5=60

3a=60×5

3a=300

a=300:3

a=100

b) 3/5×a=3/8

3a/5=3/8

3a×8=5×3

8a=5

a=5/8

c) 3/5×a=5250

3a/5=5250

3a=5250×5

3a=26250

a=26250:3

a=8750

Lacramioarabirsan666

a) 3/5×b=60

3 b/5=60

3 b=60×5

3 b=300

b=300:3

b=100

b) 3/5×b=3/8

3 b/5=3/8

3 b×8=5×3

8 b=5

b=5/8

c) 3/5×b=5250

3 b/5=5250

3 b=5250×5

3 b=26250

b=26250:3

b=8750