запишите в виде разности аликвотных дробей: 1/4×5, 1/5×6, 1/6×7, 1/8×9, 1/9×10 Образец:1/3×4 = 1/3-1/4, так как 1/3-1/4 = 4-3/3×4= 1/3×4
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