tìm X:
X chia 0,125 + X chia 0,5 + X chia 0,25 - 4 nhân X = 85/100
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X : 0,125 + X : 0,5 + X : 0,25 + 4 x X = 65/100
X x 8 + X x 2 + X x 4 - 4 x X = 0,65
X x ( 8 + 2 + 4 - 4 ) = 0,65
X x 10 = 0,65
x = 0,65 : 10
X = 0,065
\(x\) + \(x\): 0,25 + \(x\) : 0,5 + \(x\) : 0,125 = 40
\(x\) \(\times\) 1+ \(x\) \(\times\) 4 + \(x\) \(\times\) 2 + \(x\times\) 8 = 40
\(x\) \(\times\) ( 1 + 4 + 2 + 8) = 40
\(x\) \(\times\) 15 = 40
\(x\) = 40 : 15
\(x\) = \(\dfrac{8}{3}\)
x:0,125+x:0,25+x:0,5=30
=>x:(0,125+0,25+0,5)=30
=>x:0,875=30
x=30.0,875
x=26,25
2. 98,21 x a + a + 0,79 x a = 852
a x ( 98,21 + 1 + 0,79 ) = 852
a x 100 = 852
a = 852 : 100
a = 8,52
`@` `\text {Ans}`
`\downarrow`
`a,`
\(x \div 0,1 + x \div 0,25 - 35 = 35\)
`\Rightarrow x * 10 + x * 4 - 35 = 35`
`\Rightarrow x*(10+4) - 35 = 35`
`\Rightarrow 14x - 35 = 35`
`\Rightarrow 14x = 70`
`\Rightarrow x=70/14 =5`
Vậy, `x=5`
`b,`
\(x \div 0,125 - x \div 0,5 = 108\)
`\Rightarrow x * 4/5 - x*2=108`
`\Rightarrow x*(4/5 - 2) = 108`
`\Rightarrow -6/5x = 108`
`\Rightarrow x=108 \div -6/5`
`\Rightarrow x=-90`
Vậy, `x=-90.`
a) x/0,1 + x/0,25 - 35 = 35
x . 10 + x . 4 = 35 + 35
14x = 70
x = 70 : 14
x = 5
1/2 : 0,5 - 1/4 : 0,25 + 1/8 : 0,125 - 1/10 : 0,1
= 1/2 x 2 - 1/4 x 4 + 1/8 x 8 - 1/10 x 10
= 1 - 1 + 1 - 1
= 0
\(\frac{1}{2}\)\(\div\)\(0,5\)\(-\)\(\frac{1}{4}\div0,25\)\(+\)\(\frac{1}{8}\div0,125\)\(-\)\(\frac{1}{10}\div0,1\)
\(=\)\(\frac{1}{2}\)\(\div\)\(\frac{1}{2}\)\(-\)\(\frac{1}{4}\div\frac{1}{4}\)\(+\)\(\frac{1}{8}\div\frac{1}{8}\)\(-\)\(\frac{1}{10}\div\frac{1}{10}\)
\(=\)\(\frac{1}{2}\)\(\times\frac{2}{1}\)\(-\)\(\frac{1}{4}\times\frac{4}{1}\)\(+\)\(\frac{1}{8}\times\frac{8}{1}\)\(-\)\(\frac{1}{10}\times\frac{10}{1}\)
\(=\)\(1-1+1-1\)
\(=\)\(0\)
\(x\times4+x\times2+x\times10+x+x\times100=23,4\)
\(x\times\left(4+2+10+100\right)=23,4\\ x\times116=23,4\\ x=\dfrac{23,4}{116}\approx0,2\)
X:0,125+X:0,5+X:0,25-4.X=85/100 =>x=17/200
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