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10 * 30 + 20
10 (30+20)
(10 + 30) 20​


Răspuns :

300+20=320

10×50=500

40×20=800

10×30 + 20 = 300 + 20 = 320

10×(30 + 20) = 10×50 = 500

(10 + 30)×20 = 40×20 = 800