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a) 2,35 + 11,02 = 13,37
b) 18,75 + 9,39 = 28,14
c) 4,183 + 1,830 = 6,013
d) 9,07 + 26,93 = 36,00
e) 7,21 + 2,82 = 10,03
f) 35,00 + 89,17 = 124,17
6.
3¹/₂ + 5²/₃ = ⁷/₂ + ¹⁷/₃ = ²¹/₆ + ³⁴/₆ = ⁵⁵/₆ = 9¹/₆ ------------ [A]
4³/₄ + 1¹/₂ = ¹⁹/₄ + ³/₂ = ¹⁹/₄ + ⁶/₄ = ²⁵/₄ = 6¹/₄ ------------- [N]
2³/₄ + 5⁴/₆ = ¹¹/₄ + ³⁴/₆ = ³³/₁₂ + ⁶⁸/₁₂ = ¹°¹/₁₂ = 8⁵/₁₂ ----- [D]
4⁵/₆ + 2²/₃ = ²⁹/₆ + ⁸/₃ = ²⁹/₆ + ¹⁶/₆ = ⁴⁵/₆ = 7³/₆ = 7¹/₂ --- [O]
5¹/₂ + 2³/₅ = ¹¹/₂ + ¹³/₅ = ⁵⁵/₁₀ + ²⁶/₁₀ = ⁸¹/₁₀ = 8¹/₁₀ ------ [R]
3¹/₂ + 1¹/₃ = ⁷/₂ + ⁴/₃ = ²¹/₆ + ⁸/₆ = ²⁹/₆ = 4⁵/₆ -------------- [A]
7.
a) ¹/₂ + ¹/₂ = 1
⁷/₁₅ + ⁸/₁₅ = 1
1⁵/₇ + ²/₇ = 2
b) 4¹/₅ + 1³/₅
4²/₅ + 1²/₅ = 5⁴/₅
c) 4¹/₅ + 1¹/₅ = 5²/₅
4²/₅ + 1 = 5²/₅