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Efectuați calculele: A. 2 3/4:11/14-1 19/24:(35/39× 1 9/36-14/15×10/21 )
B 8/49:1/21-(1 7/18×4/75+4 7/12×16/35):1 14/27 C 2 4/5[6 1/4-1 1/10 )+4 1/11×(1 1/2±1 9/14)]-8/15

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