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suy ra 3x-3-x-5=-18
(3x-x)-(3+5)=-18
2x-8=-18
2x=-18+8
2x=-10
x=-10/2
x=-5
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`@` `\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
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co lam thi moi duoc khen ko lam ma doi duoc khen thif khen ca i dau ...khen cut
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\(=2,02\times8+2,02\times\dfrac{5}{2}+2,02\times0,5\\ =2,02\times\left(8+\dfrac{5}{2}+0,5\right)\\ =2,02\times\left(\dfrac{8.2+5+1}{2}\right)\\ =2,02\times\dfrac{22}{2}\\ =2,02\times11\\ =22,22\)
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a) x ÷ 0.25 + x + x + 0.1 = 214
x. 4 + x + x = 214 - 0.1
x. 6 = 213.9
x = 213.9 ÷ 6
x = 35.65
Vậy,...
b) 17.75 - ( 0.5 × x ÷ 2 - 4.27 ) = 15
0.5 × x ÷ 2 - 4.27 = 17.75 ÷ 15
0.5 × x ÷ 2 - 4.27 = \(\frac{71}{60}\)
0.5 × x ÷ 2 = \(\frac{71}{60}+4.27\)
0.5 × x ÷ 2 = \(\frac{409}{75}\)
0.5 × x = \(\frac{409}{75}×2\)
0.5 × x = \(\frac{818}{75}\)
x = \(\frac{818}{75}\div0.5\)
x = \(\frac{1636}{75}\)
Vậy,...
Cbht. Phần b mình không chắc nhé
\(x+x:0,25+x:0,5+x:0,125=0,45\)
\(\Rightarrow x+x:\dfrac{1}{4}+x:\dfrac{1}{2}+x:\dfrac{1}{8}=0,45\)
\(\Rightarrow x+4x+2x+8x=0,45\)
\(\Rightarrow15x=0,45\)
\(\Rightarrow x=0,3\)
Vậy x = 0,3
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