Matematică
denisarecuciu
2015-11-23 21:32:30
d) (+1/2)+(-2/3) e) (-3/4)+(+1/6) f) (-2/5)+(+3/10) g) (-5/6)+(+1/2) h) (-5/8)+(-3/4) j) (-4/7)+(+3/14)
Răspunsuri la întrebare
ovidiupencea
2015-11-24 03:28:45

d) (+1/2)+(-2/3) = = 1/2 - 2/3 = = 3/6 - 4/6 = = - 1/6 e) (-3/4)+(+1/6) = = - 3/4 + 1/6 = = -3×3/12 + 2/12 = = -9/12 + 2/12 = = - 7/12 f) (-2/5)+(+3/10) = = -2/5 + 3/10 = = -2×2/10 + 3/10 = = -4/10 + 3/10 = = - 1/10 g) (-5/6)+(+1/2) = = -5/6 + 1/2 = = -5/6 + 3/6 = = - 2 /6 = = -1/3 h) (-5/8)+(-3/4) = = - 5/8 - 3/4 = = - 5/8 -3×2/8 = = -5/8 - 6/8 = = -11/8 j) (-4/7)+(+3/14) = = - 4/7 + 3/14 = = -4×2/14 + 3/14 = = - 8 /14 + 3/14 = = - 5/14

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