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2:
a: =>x-1/5=2/15
=>x=2/15+3/15=5/15=1/3
b: =>x+7/12=-5/6-2/6=-7/6
=>x=-14/12-7/12=-21/12=-7/4
c: =>x+2/3=-10/3
=>x=-4
d: =>1/4:x=-11/4
=>x=-1/4:11/4=-1/11
e: =>8:x=1,6
=>x=5
a.8,16:(1,32+3,48)-0,345:2=8,16:4,8-0,1725
=1,7-0,1752=1,5248
b.\(71,5\times6,8+2,85:0,1\times6,8=71,5\times6,8+28,5\times6.8\)
\(=6,8\times\left(71,5+28,5\right)=6,8\times100=680\)
c.\(35,26\times6,5-154,55=229,19-154,55=74,64\)
\(B=\left(2017+0,17-3,48\right)\times\left(0,5\times\frac{1}{5}-\frac{3}{10}\right)\)
\(B=\left(2017,17-3,48\right)\times\left(0,1-\frac{3}{10}\right)\)
\(B=2013,69\times0,03\)
\(B=60,4107\)
Mình chỉ biết làm như thế thôi
\(\left(2017+0,17-3,48\right).\left(0,5.\frac{1}{5}-\frac{3}{10}\right)\)
\(=\left(2017+\frac{17}{100}-\frac{348}{100}\right).\left(\frac{5}{10}.\frac{1}{5}-\frac{3}{10}\right)\)
\(=\left(\frac{201700}{100}+\frac{17}{100}-\frac{348}{100}\right).\left(\frac{1}{10}-\frac{3}{10}\right)\)
\(=\frac{201369}{100}.\frac{-2}{10}\)
\(=-402,738\)
Đáp án C
Ta có: 8 , 16 : 1 , 32 : 3 , 48 - 0 , 45 : 2 = 8 , 16 : 4 , 8 - 0 , 45 : 2 = 1 , 7 - 0 , 225 = 1 , 475
Đáp án cần chọn là: C
\(\dfrac{5x}{1.6}+\dfrac{5x}{6.11}+\dfrac{5x}{11.16}+\dfrac{5x}{16.21}+\dfrac{5x}{21.26}+\dfrac{5x}{26.31}=1\)
\(=x\left(\dfrac{5}{1.6}+\dfrac{5}{6.11}+\dfrac{5}{11.16}+\dfrac{5}{16.21}+\dfrac{5}{21.26}+\dfrac{5}{26.31}\right)=1\)
\(=x\left(1-\dfrac{1}{6}+\dfrac{1}{6}-\dfrac{1}{11}+\dfrac{1}{11}-\dfrac{1}{16}+\dfrac{1}{16}-\dfrac{1}{21}+\dfrac{1}{21}-\dfrac{1}{26}+\dfrac{1}{26}-\dfrac{1}{31}\right)=1\)
\(=x\left(1-\dfrac{1}{31}\right)=1\)
\(\Rightarrow x=1:\left(1-\dfrac{1}{31}\right)=\dfrac{31}{30}\)
\(5^x+5^{x+2}+5^{x+4}=3255\)
\(\Rightarrow5^x\left(1+5^2+5^4\right)=3255\)
\(\Rightarrow5^x.651=3255\)
\(\Rightarrow5^x=5\Rightarrow x=1\)
a, 117 - \(x\) = 28 - (-7)
117 - \(x\) = 28 + 7
117 - \(x\) = 35
\(x\) = 117 - 35
\(x\) = 82
b, \(x\) - (-38 - 2\(x\)) = (-3) - 8 + 2\(x\)
\(x\) + 38 + 2\(x\) = - 11 + 2\(x\)
3\(x\) + 38 = - 11 + 2\(x\)
3\(x\) - 2\(x\) = - 11 - 38
\(x\) = - 49
5x+5x+1+5x+2=31
5x + 5x + 5x = 31 - 2 - 1
15x = 28
x= 28/15
5x + 3,48 – 2,35x = 5,38 – 2,9x + 10,42
5x - 2,35x + 2,9x = 5,28 + 10,42 - 3,48
5,55x = 12,22
x = 12,22 :5,55
x = \(\frac{1222}{555}\)
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