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=> |x-1,25| = 1
=> x -1,25 = 1 hoặc -1
=> x = 2,25 hoặc 0,25
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x.3,7+x.6,3=120b,x.3,7+x.6,3=120
x(3,7+6,3)=120x(3,7+6,3)=120
10x=12010x=120
x=120:10x=120:10
x=12(tm)
(15×24-x):0.25=100 : 1/4
(15×24-x):0.25 = 400
(15x24-x) = 100
360-x =100
x=260
(8.75+1.25 +5+1) x X=20
16 x X=20
X=20 :16
X=1.25
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8,25. x + 2,24. x – 0,49. x = 300
= (8,25+ 2,24 – 0,49). x = 300
= 10. x = 300
x = 300: 10
x = 30
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\(a,\) \(5.\left(4+6x\right)=290\)
\(4+6x=290:5\)
\(4+6x=58\)
\(6x=58-4\)
\(6x=54\)
\(x=54:6\)
\(x=9\left(tm\right)\)
Vậy ..................
\(b,x.3,7+x.6,3=120\)
\(x\left(3,7+6,3\right)=120\)
\(10x=120\)
\(x=120:10\)
\(x=12\left(tm\right)\)
Vậy ....................
c) \(\left(15.24-x\right):0,25=100:\dfrac{1}{4}\)
\(\left(360-x\right):\dfrac{1}{4}=400\)
\(360-x=400.\dfrac{1}{4}\)
\(360-x=100\)
\(x=360-100\)
\(x=260\left(tm\right)\)
Vậy ...................
a) 5. ( 4+6 . x ) = 290
( 4+6 . x ) = 290 : 5
4 + 6 . x = 58
6 .x = 58 - 4
6.x = 54
x = 54 : 6
x = 9
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Đề: \(25\%.x+x=-1,25\)
\(\Leftrightarrow25\%.2x=-1,25\)
\(\Leftrightarrow\frac{25}{100}.2x=-\frac{125}{100}\)
\(\Leftrightarrow\frac{1}{4}.2x=\frac{5}{4}\)
\(\Leftrightarrow2x=\frac{5}{4}:\frac{1}{4}=\frac{5}{4}.4\)
\(\Leftrightarrow2x=5\)
\(\Leftrightarrow x=5:2=\frac{5}{2}\)
Chúc Cỏ học tốt!
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\(-25\%x-x=1.25\)
\(-\frac{1}{4}x-x=\frac{5}{4}\)
\(\left(-\frac{1}{4}-1\right)\cdot x=\frac{5}{4}\)
\(-\frac{5}{4}\cdot x=\frac{5}{4}\)
\(x=-\frac{5}{4}:\frac{5}{4}\)
\(x=-1\)
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8,25 : x + 1,25 : x = 100
(8,25 + 1,25) : x = 100
9,5 : x = 100
x = 9,5 : 100
x = 0,095
8,25:x+1,25:x=100
(8,25+1,25):x=100
9,5:x=100
x=100.9,5
x=950
vậy x=950