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a có dấu dương
\(\left|a\right|=\left|1,25\right|=1,25\)
b có dấu âm
\(\left|b\right|=\left|-4,1\right|=4,1\)
c có dấu âm
\(\left|c\right|=\left|-1,414213562...\right|=1,414213562...\)
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a) (-0,5).5.(-50).0,02.(-0,2).2 = [(-0,5) . (-0,2)] . (5 . 2) . [(-50) . 0.02] = 0,1 . 10 . (-1) = 10 . (-1) = -10
b) (+9)+(-3,6)-(+4,1)-(-1,3) = 9 -3,6 - 4,1 + 1,3 = 2,6
c) (+5,2)-(+6,7)-(-5,6)+(-4,1) = 5,2 - 6,7 + 5,6 - 4,1 = (5,2 - 6,7) + (5,6 - 4,1) = -1,5 + 1,5 = 0
d) (+2,7)-(-4,3)+(-8,6)-(-0,6) = 2,7 + 4,3 - 8,6 + 0,6 = (2,7 + 4,3) - (8,6 - 0,6) = 7 - 8 = -1
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\(\Rightarrow\frac{1,35}{0,2}=\frac{1,25}{0,1x}\)
=> 1,35.0,1x=0,2.1,25
=> 0,135x=0,25
=> x=0,25:0,135
=> x=50/27
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\(a)a = 1,25\) có dấu dương, \(\left| a \right| = \left| {1,25} \right| = 1,25\)
\(b)b = - 4,1\) có dấu âm, \(\left| b \right| = \left| { - 4,1} \right| = 4,1\)
\(c)c = - 1,414213562....\) có dấu âm, \(\left| c \right| = \left| { - 1,414213562....} \right| = 1,414213562....\)
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/x-0,75/=1,25
=> 0,75= +- 1,25
* x-0,75=1,25
x=1,25+0,75
x=2
*
x-0,75=-1,25
x=-1,25+0,75
x=-0,5
\(|X-0,75|=1,25\)
\(\Rightarrow X-0,75=1.25\)hoặc x-0,75=-1,25
Nếu................................................
Vậy.............................
b) \(1,62-|x+0,2|=0\)
\(1,62=|x+0,2|\)
....................................................................................
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a, \(2,5:4x=0,5:0,2\)
\(\Rightarrow4x=\dfrac{2,5.0,2}{0,5}\)
\(\Rightarrow4x=1\Rightarrow x=\dfrac{1}{4}\)
b, \(\dfrac{1}{5}x:3=\dfrac{2}{3}:0,5\)
\(\Rightarrow\dfrac{1}{5}x=\dfrac{3.\dfrac{2}{3}}{0,5}\)
\(\Rightarrow\dfrac{1}{5}x=4\Rightarrow x=20\)
c, \(1,25:0,8=\dfrac{3}{8}:0,2x\)
\(\Rightarrow0,2x=\dfrac{0,8.\dfrac{3}{8}}{1,25}\)
\(\Rightarrow0,2x=0,24\Rightarrow x=1,2\)
Chúc bạn học tốt!!
a, \(2,5:4x=0,5:0,2\)
\(2,5:4x=2,5\)
\(4x=2,5:2,5\)
\(4x=1\)
\(x=1:4\)
\(x=\dfrac{1}{4}\)
Vậy .............
b, \(\dfrac{1}{5}x:3=\dfrac{2}{3}\)
\(\dfrac{1}{5}x=\dfrac{2}{3}.3\)
\(\dfrac{1}{5}x=2\)
\(x=2:\dfrac{1}{5}\)
\(x=10\)
Vậy .....
c, \(1,25:0,8=\dfrac{3}{8}:0,2x\)
\(1,5625=\dfrac{3}{8}:0,2x\)
\(0,2x=\dfrac{3}{8}:1,5625\)
\(0,2x=0,24\)
\(x=0,24:0,2\)
\(x=1,2\)
Vậy ...
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ta có: 1,35/0,2 = 6,75
=> 1,25/0,1.x = 6,75
0,1.x = 5/27
x = 50/27
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Giải:
a) \(\left|-4,1\right|+1,8+\left|-3,5\right|-\left|-4,1\right|-\left|-1,8\right|\)
\(=4,1+1,8+3,5-4,1-1,8\)
\(=3,5\)
b) \(\left|\dfrac{2}{5}\right|-\left|-0,2\right|.\left|-7\right|\)
\(=\dfrac{2}{5}-0,2.7\)
\(=\dfrac{2}{5}-\dfrac{7}{5}\)
\(=-1\)
c) \(\left(-15\right):\left|-3\right|+\left|0,5\right|\)
\(=\left(-15\right):3+0,5\)
\(=-5+0,5\)
\(=-4,5\)
Chúc bạn học tốt!
\(a)\left|-4,1\right|+1,8+\left|-3,5\right|-\left|-4,1\right|-\left|-1,8\right|\)
\(=4,1+1,8+3,5-4,1-1,8\)
\(=\left(4,1-4,1\right)+\left(1,8-1,8\right)+3,5\)
\(=3,5\)
\(b)\left|\dfrac{2}{5}\right|-\left|-0,2\right|.\left|-7\right|\)
\(=\dfrac{2}{5}-0,2.7\)
\(=\dfrac{2}{5}-\dfrac{7}{5}\)
\(=-1\)
\(c)\left(-15\right):\left|-3\right|+\left|0,5\right|\)
\(=\left(-15\right):3+0,5\)
\(=-5+0,5\)
\(=\dfrac{-9}{2}\)
Chúc bạn học tốt!
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a: \(=\left(-4.1-5.9\right)+\left(-13.7-6.3\right)+31\)
=31-10-20
=1
b: \(=-50\cdot0.02\cdot0.5\cdot0.2\cdot5\cdot2\)
\(=-1\cdot0.1\cdot10=-1\cdot1=-1\)
c: \(=\left(9-4.1\right)+\left(-3.6-1.3\right)\)
=4,9-4,9
=0
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a: \(=\left(1.25\right)^{16}\cdot8^{16}\cdot8=8\)
b: \(=\left(2.5\right)^9\cdot4^9\cdot4^6=4^6\cdot10^9\)