Tìm x, biết: |x| : 5 = |0,6 - 8/5|
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Tìm x biết:
a) x:8=5:4
x:8=1,25
x =1,25x8
x =10
b) 0,6 :x=x:2,4
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`@` `\text {Ans}`
`\downarrow`
`a,`
`(x-1954) \times 5=50`
`x-1954 = 50 \div 5`
`x-1954 = 10`
`x=10 + 1954`
`x= 1964`
`B.`
`48 - 40 \times x=8`
`40 \times x=48-8`
`40 \times x = 40`
` x=40 \div 40`
`x=1`
`C.`
`2+70 \div x = 3`
`70 \div x = 3-2`
`70 \div x = 1`
`x=70 \div 1`
`x=70`
`D. [3 \times (x+2) \div 7] \times 4=120`
`3 \times (x+2) \div 7 = 120 \div 4`
`3 \times (x+2) \div 7 =30`
`3 \times (x+2) = 30 \times 7`
`3 \times (x+2)=210`
`x+2=210 \div 3`
`x+2=70`
`x=70-2`
`x=68`
`E.`
`7,2 \div [ (0,6 \times x+8) \div 20 + 59] = 0,12?` Thiếu ngoặc bạn nhé._.
\(a,\left(x-1954\right)\times5=50\\ x-1954=50:5\\ x-1954=10\\ x=1954+10\\ x=1964\\b.48-40\times x=8\\40\times x=48-8\\40\times x=40\\ x=40:40\\ x=1 \\ c.2+70:X=3\\ 70:x=3-2\\ 70:x=1\\ x=70:1\\ x=70\\ d,\left[3\times\left(x+2\right):7\right]\times4=120\\ 3\times\left(x+2\right):7-120:4\\ 3\times\left(x+2\right):7=30\\ \left(x+2\right):7=30:3\\ \left(x+2\right):7=10\\ x+2=10\times7\\ x+2=70\\ x=70-2\\ x=68\)
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a) \(\left(-0,6\right)^6\cdot x=\left(\frac{-3}{5}\right)^8\)
\(x=\left(\frac{-3}{5}\right)^8:\left(\frac{-3}{5}\right)^6\)
\(x=\left(-\frac{3}{5}\right)^2=\frac{9}{25}\)
b) \(\left(0,5-x\right)^3=-8=\left(-2\right)^3\)
\(\Leftrightarrow0,5-x=-2\)
\(\Leftrightarrow x=2,5\)
Vậy,.................
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|x|:5=|0,6-8/5|
|x|:5=-1
|x|=-5
suy ra x=5