X:7=920699:70
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X÷ 7=920699÷70
\(\Rightarrow\)X = 920699 : (70 : 10)
\(\Rightarrow\)X = 92069,9
có 1 tí sai mik làm lại
X÷ 7=920699÷70
⇒X = 920699 : (70 : 7)
⇒X = 92069,9
a)15.x+15.2,7=105
15.(x+2,7)=105
x+2,7=7
x=7-2,7
x=4,3
Vậy x=4,3
b)x:7=920699:70
x:7=920699:10:7
x:7=92069,9:7
x=92069,9
Vậy x=92069,9
c)5.x-1952=2500-1947
5.x-1952=553
5.x=2505
x=501
Vậy x=501
d)x.2016-x=2016.2017+2016
x.(2016-1)=2016.(2017+1)
x.2015=2016.2018
x=\(\frac{2016.2018}{2015}\)
Vậy x\(\frac{2016.2018}{2015}\)
15.x+15.2,7=105
<=> 15.( x + 2,7 ) = 105
=> x + 2,7 = 7
=> x = 7 - 2,7
=> x = 4,3
x:7=920699:70
<=> x . 70 = 920699 . 7
=> x . 70 = 6444893
=> x = 6444893 : 70
=> x = 92069,9
5.x-1952=2500-1947
=> 5x - 1952 = 553
=> 5x = 553 + 1952
=> 5x = 2505
=> x = 2505 : 5
=> x = 501
x.2016-x=2016.2017+2016
=> x ( 2016 - 1 ) = 2016 ( 2017 + 1)
=> x . 2015 = 2016 . 2018
=> x : 2018 = 2016 : 2015
=> x : 2018 = \(\frac{2016}{2015}\)
=> x = \(\frac{2016}{2015}.2018\approx2019\)
\(\dfrac{3}{7}-\dfrac{2}{5}=\dfrac{x}{70}\)
=> \(\dfrac{1}{35}=\dfrac{x}{40}\)
=> \(40=35\times x\)
=> \(x=40\div35\)
=> \(x=\dfrac{8}{7}\)
\(\dfrac{3}{7}-\dfrac{2}{5}=\dfrac{x}{70}\)
\(\dfrac{15}{35}-\dfrac{14}{35}=\dfrac{x}{70}\)
\(\dfrac{1}{35}=\dfrac{x}{70}\)
\(\dfrac{2}{70}=\dfrac{x}{70}\)
\(x=2\)
\(\left(x+7\right)^{10}.\left(x+2\right)^2=5^0.7^0\)
\(\Rightarrow\left(x+7\right)^{10}.\left(x+2\right)^2=1.1=1\)
mà \(\left\{{}\begin{matrix}\left(x+7\right)^{10}\ge0,\forall x\\\left(x+2\right)^2\ge0,\forall x\end{matrix}\right.\)
\(\Rightarrow\left(x+7\right)^{10};\left(x+2\right)^2\in\left\{1\right\}\left(x\inℕ\right)\)
\(\Rightarrow\left\{{}\begin{matrix}\left(x+7\right)^{10}=1\\\left(x+2\right)^2=1\end{matrix}\right.\) (Vô lý)
\(\Rightarrow x\in\varnothing\)
bn ơi,hình như sai đề!!!
x = 92069,9