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\(\frac{30}{11}\times\frac{66}{25}\times\frac{75}{210}\)
\(=\frac{30\times6\times11\times3\times25}{11\times25\times30\times7}\)
\(=\frac{18}{7}\)
\(\left(\frac{8}{11}+\frac{3}{12}\right)+\frac{3}{11}\)
\(=\frac{8}{11}+\frac{3}{12}+\frac{3}{11}\)
\(=\left(\frac{8}{11}+\frac{3}{11}\right)+\frac{3}{12}\)
\(=1+\frac{3}{12}\)
\(=\frac{5}{4}\)
Matcha
\(\frac{30}{11}\times\frac{66}{25}\times\frac{75}{210}\)
\(=\frac{30\times66\times75}{11\times25\times210}\)
\(=\frac{1\times6\times3}{1\times1\times7}\)
\(=\frac{18}{7}\)
\(\left(\frac{8}{11}+\frac{3}{12}\right)+\frac{3}{11}\)
\(=\frac{8}{11}+\frac{3}{12}+\frac{3}{11}\)
\(=1+\frac{3}{12}\)
\(=1+\frac{1}{4}\)
\(=\frac{5}{4}\)
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`x xx2+x xx3=4`
`x xx(2+3)=4`
`x xx5=4`
`x=4:5=4/5`
_______________________
`x xx9-1,5=30`
`x xx9=30+1,5`
`x xx 9=31,5`
`x=31,5:9`
`x=3,5`
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3x.12x+3x.(-4)-9x.4x-9x.(-3)=30
36x2-12x-36x2-27x=30
24x-9x=30
15x=30
=>x=30:15
=>x=2
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5x - 15 = 50 : 0,25 3,5 - 2 . ( x - 1 ) = 1,5 145 - ( x -13 ) = 45 4x + 30 = 50
5x - 15 = 200 2 . ( x - 1 ) = 3,5 - 1,5 x - 13 = 145 - 45 4x = 50 - 30
5x = 200 + 15 2 . ( x - 1 ) = 2 x - 13 = 100 4x = 20
5x = 215 x - 1 = 2 : 2 x = 100 + 13 x = 20 : 4
x = 215 : 5 x - 1 = 1 x = 113 x = 5
x = 43 x = 1 + 1
x = 2
Nếu đúng k cho mình nhé
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\(\dfrac{4}{3}\) = \(\dfrac{20}{4}\)\(x\) - 1
5\(x\) - 1 = \(\dfrac{4}{3}\)
5\(x\) = \(\dfrac{4}{3}\) + 1
5\(x\) = \(\dfrac{7}{3}\)
\(x\) = \(\dfrac{7}{3}\) : 5
\(x\) = \(\dfrac{7}{15}\)
b,
2\(\times\)\(x\) = 3\(\times\) y
\(x\) = \(\dfrac{3}{2}\) \(\times\) y
y - \(\dfrac{3}{2}\) \(\times\) y = 5
\(y\) \(\times\) ( 1 - \(\dfrac{3}{2}\)) = 5
\(y\) \(\times\) - \(\dfrac{1}{2}\) = 5
\(y\) = 5 : (-\(\dfrac{1}{2}\))
\(y\) = - 10
\(x\) = y - 5 = -10 - 5 =-15
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\(\left(x-1\right)+\left(x-2\right)+\left(x-3\right)=30\)
\(\left(x-1\right)+\left(x-2\right)+\left(x-3\right)=3.\left(x-2\right)\)
\(3.\left(x-2\right)=30\)
\(3.x-2.3=30\)
\(3.x-6=30\)
\(3.x\) \(=30+6\)
\(3.x\) \(=36\)
\(x\) \(=36:3\)
\(x\) \(=12\)
Vậy \(x=12\)