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a. x +\(\frac{1}{5}=\frac{-4}{9}\)
=> x = \(\frac{-4}{9}-\frac{1}{5}\)
=> x = \(\frac{-29}{45}\)
b. 2-(x+\(\frac{3}{7}\))= \(\frac{9}{-21}\)
=> 2-x -\(\frac{3}{7}\)= \(\frac{9}{-21}\)
=> -x+\(\frac{11}{7}\)= \(\frac{9}{-21}\)
=> x = 2
Câu c tương tự câu b cứ làm từ từ là ra.
Chọn đúng cho mình nha các bạn
a; - \(\dfrac{1}{3}\).(15\(x-9\)) + \(\dfrac{2}{7}\).(- \(x-34\)) = 1 - \(\dfrac{3}{4}\).(-16\(x+4\))
- 5\(x\) + 3 - \(\dfrac{2}{7}\)\(x\) - \(\dfrac{68}{7}\) = 1 + 12\(x\) - 3
12\(x\) + 5\(x\) + \(\dfrac{2}{7}x\) = 3 - \(\dfrac{68}{7}\) - 1 + 3
17\(x\) + \(\dfrac{2}{7}x\) = (3 - 1 + 3) - \(\dfrac{68}{7}\)
\(\dfrac{121}{7}\)\(x\) = 5 - \(\dfrac{68}{7}\)
\(\dfrac{121}{7}\) \(x\) = - \(\dfrac{33}{7}\)
\(x\) = - \(\dfrac{33}{7}\): \(\dfrac{121}{7}\)
\(x\) = - \(\dfrac{3}{11}\)
Vậy \(x\) = - \(\dfrac{3}{11}\)
\(15x-22:8+65=9^2 \Leftrightarrow 15x=91-65+22:8 \\\ \Leftrightarrow 15x=28,75 \Leftrightarrow x=\dfrac{28,75}{15} \\\ KL:............\)
=> 15x - 2,75+ 65 = 81
=> 15x + 62,25 = 81
=>15x = 81 - 62,25 = 18,75
=> x = 18,75 : 15 = 1.25
a: B=(1+2-3-4)+(5+6-7-8)+...+(109+110-111-112)+227
=(-4)+(-4)+...+(-4)+227
=-112+227=115
b: =>(15x+364):x=41
=>15x+364=41x
=>-26x=-364
=>x=14
a . ( 17x + 23 ) : 12 = 9
=> 17x + 23 = 9 x 12
=> 17x + 23 = 108
=> 17x = 108 - 23
=> 17x = 85
=> x = 5
Vậy x = 5
b . 345 - ( 15x + 63 ) = 102
=> 15x + 63 = 345 - 102
=> 15x + 63 = 243
=> 15x = 243 - 63
=> 15x = 180
=> x = 12
Vậy x = 12
c . ( 11x - 23 ) . 73 = 5 . 75
=> ( 11x - 23 ) . 73 = 84035
=> ( 11x - 23 ) . 343 = 84035
=> 11x - 8 = 84035 : 343
= > 11x - 8 = 245
=> 11x = 245 + 8
=> 11x = 253
=> x = 23
Vậy x = 23
1. \(x-8+32=68\)
\(x-8=68-32\)
\(x-8=36\)
\(x=36+8\)
\(x=44\)
_____
2. \(x+8+32=68\)
\(x+8=68-32\)
\(x+8=36\)
\(x=36-8\)
\(x=28\)
_____
3. \(98-x+34=43\)
\(98-x=43-34\)
\(98-x=9\)
\(x=98-9\)
\(x=89\)
_____
4. \(98+x-34=43\)
\(98+x=43+34\)
\(98+x=77\)
\(x=77-98\)
\(x=-21\)
_____
5. \(x:5:4=800\)
\(x:5=800.4\)
\(x:5=3200\)
\(x=3200.5\)
\(x=16000\)
_____
6. \(18+x=384:8\)
\(18+x=48\)
\(x=48-18\)
\(x=30\)
_____
7. \(\left(84,6-2\times x\right):3,02=5,1\)
\(84,6-2.x=5,1.3,02\)
\(84,6-2.x=15,402\)
\(2.x=84,6-15,402\)
\(2.x=69,198\)
\(x=69,198:2\)
\(x=34,599\)
_____
8. \(x\times5=120:6\)
\(x.5=20\)
\(x=20:5\)
\(x=4\)
_____
9. \(\left(15\times24-x\right):0,25=100:0,25\)
\(\left(15.24-x\right):0,25=400\)
\(15.24-x=400.0,25\)
\(15.24-x=100\)
\(360-x=100\)
\(x=360-100\)
\(x=260\)
1,x-8+32=68
=>x-8=68-32=36
=>x=36+8=42
2,x+8+32=68
=>x+8=68-32=36
=>x=36-8=28
3,98-x+34=43
=>98-x=43-34=9
=>x=98-9=89
4,98+x-34=43
=>98+x=43+34=77
=>x=77-98=-21
5,x:5:4=800
=>x:20=800
=>x=800x20=16000
6,18+x=384:8=48
=>x=48-18=30
7,(84,6-2x):3,02=5,1
=>84,6-2x=5,1x3,02=15,402
=>2x=84,6-15,402=69,198
=>x=69,198:2=34,599
8,5x=120:6=20
=>x=20:5=4
9,(15x24-x):0,25=100:0,25=400
=>360-x=400x0,25=100
=>x=360-100=260.
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