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Khristyan
@Khristyan
December 2019
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Alguem pode me ajudar a resolver essas expressoes numericas com fraçao? por favor
12-5:(-4/3) =
3/7 x (-7/5) - 5/8 : (-5/2) =
(-4/9 + 1/15) : (-5/6 - 1/9) =
4 . (2/9) + (-5/3) : (2/9)
5 . (3/4) -3/4 : (-3/8)
Por favor me ajuda =D
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rosanev
a) 12-5:(-4/3) =
↓
12 - 5.3/1.(-4) =
12 - 15/(-4) =
12 + 15/4 =
(12.4 + 15)/4 = 63/4
b) 3/7 x (-7/5) - 5/8 : (-5/2) =
↓ ↓
3(-7)/7.5 - 5(-2)/8.5 =
↓ ↓
-21/35 + 10/40 =
(-21.40 + 10.35)/1400 =
(-840 + 350)/1400 =
-490/1400 = -49/140 = -7/20
c) (-4/9 + 1/15) : (-5/6 - 1/9) =
↓ ↓
(-4.15 + 1.9)/(9.15) : (-5.9 -1.6)/(6.9) =
↓ ↓
(-60 + 9)/ 135 : (-45 - 6 )/54 =
↓ ↓
-51/135 : -51/54 =
↓
(-51/135) x (54/-51) =
54/135 (÷3 para simplificar a fração) =
18/45 (÷ 3) = 6/15 = 3/5
4 . (2/9) + (-5/3) : (2/9) =
↓
(3.2 - 5.9)/3.9 : (2/9) =
↓
(6 - 45)/27 : (2/9) =
(-39/27) : (2/9) =
↓
(-39.9)/(27.2) =
351/54 = (÷9 para simplificar a fração)
39/6 = (÷ 3 para simplificar a fração)
13/2
5 . (3/4) -3/4 : (-3/8) =
↓
(3/4) - (-3.8)/(-3.4) =
↓
(3/4) - (-24)/(-12) =
(3/4) - 2/1 =
mmc = 4
3/4 - 2.4/4 =
3/4 - 8/4 = -5/4
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↓
12 - 5.3/1.(-4) =
12 - 15/(-4) =
12 + 15/4 =
(12.4 + 15)/4 = 63/4
b) 3/7 x (-7/5) - 5/8 : (-5/2) =
↓ ↓
3(-7)/7.5 - 5(-2)/8.5 =
↓ ↓
-21/35 + 10/40 =
(-21.40 + 10.35)/1400 =
(-840 + 350)/1400 =
-490/1400 = -49/140 = -7/20
c) (-4/9 + 1/15) : (-5/6 - 1/9) =
↓ ↓
(-4.15 + 1.9)/(9.15) : (-5.9 -1.6)/(6.9) =
↓ ↓
(-60 + 9)/ 135 : (-45 - 6 )/54 =
↓ ↓
-51/135 : -51/54 =
↓
(-51/135) x (54/-51) =
54/135 (÷3 para simplificar a fração) =
18/45 (÷ 3) = 6/15 = 3/5
4 . (2/9) + (-5/3) : (2/9) =
↓
(3.2 - 5.9)/3.9 : (2/9) =
↓
(6 - 45)/27 : (2/9) =
(-39/27) : (2/9) =
↓
(-39.9)/(27.2) =
351/54 = (÷9 para simplificar a fração)
39/6 = (÷ 3 para simplificar a fração)
13/2
5 . (3/4) -3/4 : (-3/8) =
↓
(3/4) - (-3.8)/(-3.4) =
↓
(3/4) - (-24)/(-12) =
(3/4) - 2/1 =
mmc = 4
3/4 - 2.4/4 =
3/4 - 8/4 = -5/4