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A) [(3/8+5/12)×1/19+1/4]×8/21=
B) [4/15+7/20-1/6):(1/2+2/5)]×2=
C) [3/7+4/21):(1/12+1/14)-3intregi 10/5]×10=


Ma puteți ajuta va roggg muuultt​