x - 617 x 3 = 65527 - 41724
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a.\(\left(258-79\right)-\left(111-90\right)\)
\(=258-79-111+90\)
\(=258+\left(-79\right)+\left(-111\right)+90\)
\(=258+\left[\left(-79\right)+\left(-111\right)\right]+90\)
\(=258+\left(-190\right)+90\)
\(=258+\left(-100\right)\)
\(=158\)
b.\(\left(617-304\right)-\left(617+254\right)\)
\(=617-304-617-254\)
\(=617+\left(-304\right)+\left(-617\right)+\left(-254\right)\)
\(=\left[617+\left(-617\right)\right]+\left[\left(-304\right)+\left(-254\right)\right]\)
\(=0+\left(-558\right)\)
\(=-558\)
c.\(\left(217-372\right)-\left(217-465\right)-\left(465+372\right)\)
\(=217-372-217+465-465-372\)
\(=217+\left(-372\right)+\left(-217\right)+465+\left(-465\right)+\left(-372\right)\)
\(=\left[217+\left(-217\right)\right]+\left[\left(-372\right)+\left(-372\right)\right]+\left[465+\left(-465\right)\right]\)
\(=0+\left(-744\right)+0\)
\(=-744\)
d.\(\left(x+y+z+t\right)-\left(x+y+z-t\right)-\left(y+z+t-x\right)-\left(z+t+x-y\right)-\left(t+x+y-z\right)\)
\(=x+y+z+t-x-y-z+t-y-z-t+x-z-t-x+y-t-x-y+z\)viết hoài mỏi tay nên khúc sau tự làm nhé ^_^
A) (47+53)x298=29800
B) (426+574)x617=617000
C) 396x(37-27)=3960
7\(x\) - 2\(x\) = 617 : 615 + 44 : 11
5\(x\) = 62 + 4
5\(x\) = 36 + 4
5\(x\) = 40
\(x\) = 40 : 5
\(x\) = 8
\(\dfrac{1}{x}+\dfrac{1}{y}=\dfrac{1}{617}\)
\(\Rightarrow\dfrac{x+y}{xy}=\dfrac{1}{617}\)
\(\Rightarrow617\left(x+y\right)=xy\)
\(\Rightarrow617x+617y=xy\)
\(\Rightarrow617x+617y-xy+617^2=617^2\)
\(\Rightarrow\left(y-617\right)\left(x-617\right)=617^2\)
\(\Rightarrow\left[{}\begin{matrix}x-617=617\\y-617=617\end{matrix}\right.\)
\(\Rightarrow x=y=1234\)
NÈ BẠN!!!
a) x+123.2=1245
\(x+246=1245\)
\(x=1245-246=999\)
b) 987+x=1443
\(x=1443-987=456\)
c) 2468:x=617
\(x=2468:617=4\)
NHỚ K MÌNH NHA!!!
(617/191+29/33-115/117)*(1/4-1/5-1/20)
= (617/191+29/33-115/117)*(5/20-4/20-1/20)
=(617/191+29/33-115/117)*0
=0
a) \(5x+x=39-3^{11}:3^9\)
\(\Leftrightarrow6x=39-3^2\)
\(\Leftrightarrow6x=30\)
\(\Leftrightarrow x=5\)
b) \(2^x:2^5=16\)
\(\Leftrightarrow2^x:2^5=2^4\)
\(\Leftrightarrow2^x=2^4.2^5\)
\(\Leftrightarrow2^x=2^9\)
\(\Leftrightarrow x=9\)
c) \(7x-x=5^{21}:5^{19}+3.2^2-7^0\)
\(\Leftrightarrow6x=5^2+3.4-1\)
\(\Leftrightarrow6x=36\)
\(\Leftrightarrow x=6\)
d) \(7x-2x=6^{17}:6^{15}+44:11\)
\(\Leftrightarrow5x=6^2+4\)
\(\Leftrightarrow5x=40\)
\(\Leftrightarrow x=8\)
a)⇔6x=39-32
⇔6x=30
⇔ x=5
b)2x:25=16
⇔2x=24.25
⇔ 2x=29
⇔ x=9
c)⇔6x=52+3.22-1
⇔ 6x= 36
⇔ x=6
d)⇔5x=62+4
⇔ 5x=40
⇔ x=8
\(x-617 \times 3=65527-41724\)
\(x-1851=23803\)
`x=23803+1851`
`x=25654`
x - 617 x 3 = 65527 - 41724
x - 617 x 3 = 23803
x - 1851 = 23803
x = 23803 + 1851
x = 25654