-2⅓ + (3½- 2⅓) * 3 =
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-2⅓ + (3½- 2⅓) * 3 = -2⅓ + (3 3/6 - 2 2/6) * 3 = -2⅓ + (1 1/6 * 3) = -2⅓ + (7/6 * 3) = -2⅓ + 21/6 = -2 1/3 + 3 3/6 = -2 2/6 + 3 3/6 = -14/6 + 21/6 = 7/6 = 1 1/6
-2⅓ +(3½ -2⅓) ·3 =-7/3 +(7/2 -7/3)·3 =-7/3 +(21/6 - 14/6)·3 =-7/3 +7/6·3 =
-7/3 + 21/6 =-14/6 +21/6 =7/6 =1¹/₆
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-2⅓ + (3½- 2⅓) * 3 = -2⅓ + (3 3/6 - 2 2/6) * 3 = -2⅓ + (1 1/6 * 3) = -2⅓ + (7/6 * 3) = -2⅓ + 21/6 = -2 1/3 + 3 3/6 = -2 2/6 + 3 3/6 = -14/6 + 21/6 = 7/6 = 1 1/6
-2⅓ +(3½ -2⅓) ·3 =-7/3 +(7/2 -7/3)·3 =-7/3 +(21/6 - 14/6)·3 =-7/3 +7/6·3 =
-7/3 + 21/6 =-14/6 +21/6 =7/6 =1¹/₆