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13/47 . 1/8 + 13/2 . 1/47 +13/47 . -13/8 -34/47=13/47 . 1/8 + 13/47 . 1/2 + 13/47 . -13/8 -34/47=13/47 . [1/8 + 1/2 +(-13/8)] -34/47=13/47 .[1/8 + 4/8 + (-13/8)] -34/47=13/47.(-8/8) -34/47= -13/47 - 34/47=(-13/47)+(-34/47)=-47/47=-1 xong
cho 13/2 . 1/47 =13/47 . 1/2 la dung nha vi phep nhan phan so duoc doi mau so nha
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\(\dfrac{8}{9}.\left(\dfrac{-7}{13}\right)-\dfrac{8}{9}.\dfrac{6}{13}+2.\dfrac{8}{9}\)
=\(\dfrac{8}{9}.\left(\dfrac{-7}{13}-\dfrac{6}{13}+3\right)\)
=\(\dfrac{8}{9}.\left(1\right)\)
=\(\dfrac{8}{9}\)
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a, 13 - 18 - ( - 42 ) -1 5 = 22
c,(-8 ) ^ 3 : ( - 8 ) ^ 2 +8 = 0
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a ) 13 - 18 - ( - 42 ) - 15
= 13 - 18 + 42 - 15
= -5 + 42 - 15
= 37 - 15
= 22
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cái này dễ mak bn,hok lý thuyết ik,nhưng mk bt là bn bt lm bài này
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\(a,13-18-\left(-42\right)-15\)
\(=13-18+42-15\)
\(=\left(13-15\right)-\left(18+42\right)\)
\(=-2-60\)
\(=-62\)
\(b,369-4\left[\left(-5\right)+4.\left(-8\right)\right]\)
\(=369-4\left[\left(-5\right)+\left(-32\right)\right]\)
\(=369-4.\left(-37\right)\)
\(=369-\left(-148\right)\)
\(=369+148\)
\(=517\)
\(c,\left(-8\right)^3:\left(-8\right)^2+8\)
\(=-512:64+8\)
\(=-8+8\)
\(=0\)
\(d,\left(-12\right)\left(-13\right)+13.\left(-29\right)\)
\(=156+-377\)
\(=156-377\)
\(=-221\)
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\(\dfrac{8}{13}-\dfrac{7}{29}-\dfrac{8}{13}+\dfrac{7}{29}+\dfrac{2019}{2020}=\left(\dfrac{8}{13}-\dfrac{8}{13}\right)-\left(\dfrac{7}{29}+\dfrac{7}{29}\right)+\dfrac{2019}{2020}=0-0+\dfrac{2019}{2020}=\dfrac{2019}{2020}\)
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(7 . 13 + 8 . 13) / (8 + 21 - x) = 39
13 (7 + 8) / (8 + 21 - x) = 39
13 . 15 / (8 + 21 - x) = 39
13 . 3 . 5 / (8 + 21 - x) = 39
39 . 5 / (8 + 21 - x) = 39
5 / (29 - x) = 1
29 - x = 5
x = 24
( -8 ) . ( - 13 ) = 8 . 13 = 104
TL:
(-8).(-13)
= 104
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HT