Tìm x
a) x + 216 = 570
b) x – 129 = 427
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a) 162 : 𝑥 + 216 : 𝑥 = 6
(162 + 216) : x = 6
378 : x = 6
x = 378 : 6
x = 63
b) 602 : x + 123 x 2 = 253
602 : x + 246 = 253
602 : x = 253 - 246
602 : x = 7
x = 602 : 7
x = 86
c) 486 : x - 126 :x = 6
(486-126) : x = 6
360 : x = 6
x = 360 : 6
x = 60
d) 725 : x + 175 : x = 5
(725 + 175) : x = 5
900 : x = 5
x = 900 : 5
x = 180
a)\(162:x+216:x=6\)
⇔\(\left(162+216\right):x=6\)
⇔\(378:x=6\)
⇔\(x=63\)
b)\(602:x+123.2=253\)
⇔\(602:x+246=253\)
⇔\(602:x=7\)
⇔\(x=86\)
c)\(486:x-126:x=6\)
⇔\(\left(486-126\right):x=6\)
⇔\(360:x=6\)
⇔\(x=60\)
d)\(725:x+175:x=5\)
⇔\(\left(725+175\right):x=5\)
⇔\(900:x=5\)
⇔\(x=180\)
\(a.162:x+216:x=6\) \(b.602:x+123x2=253\)
\(\left(162+216\right):x=6\) \(602:x+246=253\)
\(378:x=6\) \(602:x=253-246\)
\(x=378:6=63\) \(602:x=7\)
\(x=602:7=86\)
\(c.486:x-126:x=6\) \(d.725:x+175:x=5\)
\(\left(486-126\right):x=6\) \(\left(725+175\right):x=5\)
\(360:x=6\) \(900:x=5\)
\(x=360:6=60\) \(x=900:5=180\)
b: Ta có: \(6^{2x-1}=216\)
\(\Leftrightarrow2x-1=3\)
hay x=2
c: Ta có: \(x^3=25x\)
\(\Leftrightarrow x\left(x-5\right)\left(x+5\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x=5\\x=-5\end{matrix}\right.\)
biết x\(\in\left\{129,216\right\}\)
\(129=3\times43\)
\(216=2^3\times3^3\)
ƯCLN(129,216)=3
vậy x=3
42700=427*100
427*213-427*x=42700
427*213-427*x=427*100
427*x=427*213-427*100
427*x=427*[213-100]
427*x=427*113
Vậy x=113
427*213-427*x=42700
427*(213-x)=42700
213-x =42700:427
213-x = 100
x = 213-100
x = 113.
K nhé
427*213-427*x=42700
=>427*(213-x) = 42700
=> 213-x = 42700 : 427
=> 213-x = 100
=> x =213-100
=> x = 113
Vậy x = 113
mk nhanh nhất, tk mk nhé.
a. X + 673 = 768
X = 768 – 673
X = 95
b. X : 7 = 427
X = 427 x 7
X = 2989
a) x + 216 = 570
x = 570 – 216
x = 354
b) x – 129 = 427
x = 427 + 129
x = 556