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45:X×100=900. cum se face?

Răspuns :

49 : x × 100 = 900
45 : x = 900 : 100
45 : x = 9
x = 45 : 9
x = 5.
45/x*100=900
45*100/x=900
4500/x=900
4500=900*x
x=4500:900
x=5