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(1/2+1/5)*20/7=2 Va rog ajutati-ma

Răspuns :

1/2 +1/5= 5/10+ 2/10 =7/10
7/10 ×20/7= 140/70 (÷70) = 2
(1/2+1/5)x20/7= ( 5/10 + 2/10 ) x 20/7 = 7/10 x 20/7 = 20/10 = 2