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\(a,\left(-8,5\right)+16,35+\left(-4,5\right)-\left(-2,25\right)\\ =\left[\left(-8,5\right)+\left(-4,5\right)\right]+\left[16,35-\left(-2,25\right)\right]\\ =-13+18,6=5,6\\ b,5,63+\left(-2,75\right)-\left(-8,94\right)+9,06-15,25\\ =5,63-2,75+8,94+9,06-15,25\)
\(=5,63-\left(2,75+15,25\right)+\left(8,94+9,06\right)\\ =5,63-18+18\\ =5,63\)
a) (-8,5) + 16,35 + (-4,5) - (-2,25) = 5,6
b) 5,63 + (-2,75) - (-8,94) + 9,06 - 15,25 = 5,63
![](https://rs.olm.vn/images/avt/0.png?1311)
c) (-5,25) . 3 = -15.75
d) 6,79 + (-8,5) + 12,21
= -1.71 + 12.21
= 10.5
e) 2,7 . (-4,5) + 2,7 . (-5,5)
= -12.15 + (-14.85)
= -27
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`a)(4,5-2x)*1 4/7=11/14`
`=>(4,5-2x)*11/7=11/14`
`=>4,5-2x=1/2`
`=>2x=4,5-0,5=4`
`=>x=2`
Vậy `x=2`
`b)(2,8x-32):2/3=-90`
`=>2,8x-32=-90*2/3=-60`
`=>2,8x=-28`
`=>x=-10`
Vậy `x=-10`
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\(\left(\frac{1}{4}x-1\right)+\left(\frac{5}{6}x-2\right)-\left(\frac{3}{8}x+1\right)=4,5\)
\(\frac{1}{4}x-1+\frac{5}{6}x-2-\frac{3}{8}x-1=\frac{9}{2}\)
\(\left(\frac{1}{4}x+\frac{5}{6}x-\frac{3}{8}x\right)=\frac{9}{2}+1+2+1\)
\(\frac{17}{24}x=\frac{17}{2}\)
\(x=\frac{17}{2}:\frac{17}{24}\)
\(x=\frac{17}{2}.\frac{24}{17}\)
\(x=\frac{24}{2}\)
\(x=12\)
vậy \(x=12\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a: \(=\dfrac{1.8\cdot4.5}{0.25}\cdot\dfrac{1.4}{4.2}+4.33=\dfrac{32.4}{3}+4.33=10.8+4.33=15.13\)
b: \(=1003.55-3.55-999=1000-999=1\)
c: \(=3.78\left(200-68-100+68\right)=100\cdot3.78=378\)
d: \(=0.1\cdot\dfrac{\left(4.8+1.5\right)\cdot\left[\left(4.8-1.5\right):0.3+1\right]}{2}=3.78\)