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40 supra 100 × x = 120

Răspuns :

40/100*x=120
40*x/100=120
40x/100=120
Inmultim mezii si extremii:
40x=120*100
40x=12000
x=12000:40
x=300
X ×40/100 = 120
40×X = 120×100
X = 120×100/40
X = 3×100
X = 300