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Calculati;a)1/8+1/8x4 ;b1/6+1/6:1/3;c)4/9+3/10:6/10 d1 1/3x2 1/2+6;e)2 1/7x1 1/5-1/21:1/3; f)5/6:(1/3+1/2:1/3)