Tìm x :
25 3 - x = 5 6
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\(a.\dfrac{12+x}{42}=\dfrac{35}{42}\Leftrightarrow12+x=35\Leftrightarrow x=23\)
\(b.\dfrac{25-x}{40}=\dfrac{3}{8}\Leftrightarrow\dfrac{25-x}{40}=\dfrac{15}{40}\Leftrightarrow25-x=15\Leftrightarrow x=10\)
\(c.\dfrac{13+x}{20}=\dfrac{3}{4}\Leftrightarrow\dfrac{13+x}{20}=\dfrac{15}{20}\Leftrightarrow13+x=15\Leftrightarrow x=2\)
\(d.\dfrac{23-x}{25}=\dfrac{20}{25}\Leftrightarrow23-x=20\Leftrightarrow x=3\)
x : 5 = 13 x : 6 = 25 x : 3 = 48
x = 13 x 5 x = 25 x 6 x = 48 x 3
x = 65 x = 150 x = 144
\(2+5+3=x-3\)
\(=10=x-3\)
\(\Rightarrow x=10+3=13\)
\(5+25=x\cdot6\)
\(=30=x\cdot6\)
\(\Rightarrow x=30:6=5\)
Ủng hộ mk nka!!!^_^^_^^_^
2+5+3=x-3
10 = x-3
x-3 = 10
x = 10+3 = 13
5+25 = x.6
30 = x.6
x.6 = 30
x = 30 : 6 = 5
\(x\) \(\times\) \(\dfrac{4}{5}\) = 15
\(x\) = 15 : \(\dfrac{4}{5}\)
\(x\) = \(\dfrac{75}{4}\)
\(\dfrac{12}{25}\) \(\times\) \(x\) = \(\dfrac{4}{10}\)
\(x\) = \(\dfrac{4}{10}\) : \(\dfrac{12}{25}\)
\(x\) = \(\dfrac{5}{6}\)
x = 25/3 - 5/6
x = 45/6 = 15/2( rút gọn cho 3)
Vậy x = 15/2
1: =>x=8-35=-27
2: =>15-4+x=6
=>x+11=6
hay x=-5
3: =>-30+25-x=-1
=>x+5=1
hay x=-4
4: =>x-(-13)=-8
=>x+13=-8
hay x=-21
5: =>x-29-17+38=-9
=>x-8=-9
hay x=-1
=>-2x-3/5=-5/6*8/25=-40/150=-4/15
=>-2x=-4/15+3/5=5/15=1/3
=>x=-1/6