Giúp mình câu 3 và 4 nha
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0,8x 1 +3/4 -7/6 +0,25
=0,8 +3/4 -7/6+1/4
=4/5 +3/4-7/6+1/4
=(3/4 + 1/4) +4/5 - 7/6
=1+4/5 - 7/6
=9/5-7/6
=19/30
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( 2x + 3 ) 3 = -125
( 2x + 3 ) 3 = ( -5 ) 3
=> 2x + 3 = -5
2 x = -8
x = -4
( x + 1 / 4 ) 4 = 625 / 256
( x + 1 / 4 ) 4 = ( 5 / 4 ) 4
=> x + 1 / 4 = 5/4
x = 4 / 4
x = 1
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`3/4-(2/3+3/4)+2/3+2022/2023`
`=3/4 - 2/3 - 3/4 +2/3 +2022/2023`
`= (3/4 -3/4 ) + (-2/3 +2/3) +2022/2023`
`= 0+0+2022/2023`
`=2022/2023`
\(\dfrac{3}{4}-\left(\dfrac{2}{3}+\dfrac{3}{4}\right)+\dfrac{2}{3}+\dfrac{2022}{2023}\)
\(=\dfrac{3}{4}-\left(\dfrac{8}{12}+\dfrac{9}{12}\right)+\dfrac{2}{3}+\dfrac{2022}{2023}\)
\(=\dfrac{3}{4}-\dfrac{17}{12}+\dfrac{2}{3}+\dfrac{2022}{2023}\)
\(=\dfrac{9}{12}-\dfrac{17}{12}+\dfrac{8}{12}+\dfrac{2022}{2023}\)
\(=\dfrac{9-17+8}{12}+\dfrac{2022}{2023}=\dfrac{0}{12}+\dfrac{2022}{2023}=0+\dfrac{2022}{2023}\)
\(=\dfrac{2022}{2023}\)
#YTVA
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Bài 1:
a: -5-12=-17
b: (-4)x14=-56
c: 6-12=-6
Bài 2:
a: =-5+42-15=42-20=22
b: \(=369-4\cdot\left[-5-32\right]=369+148=517\)
c: \(=-8+8=0\)
d: \(=13\left(-12-29\right)=13\cdot\left(-41\right)=-533\)