Ответы на вопрос:
2/5×6/13+1/4×6/13 = 6/13(2/5+1/4) = 6/13(8/20+5/20) = 6/13×13/20 = 3×1/10 = 3×0,1 = 0,3 5/8×5/6-1/4×5/6 = 5/6(5/8-1/4) = 5/6(5/8-2/8) = 5/6×3/8 = 5/2×1/8 = 2,5×1/8= 0,3125 3/5-3/5×2/7 = 3/5-6/35 = 21/35-6/35 = 15/35= 3/7 1/7×1/8+1/7×1/6 = 1/7(1/8+1/6) = 1/7(6/48+8/48) = 1/7(14/48) = 1/7(7/24) = 1/7×7/24 = 1×1/24 = 1/24
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