x/13 + 15/26 = 23/26
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a,\(\frac{1}{5}\times\frac{2}{9}\div\frac{1}{15}\)
\(=\frac{1}{5}\times\frac{2}{9}\times15\)
\(=\left(\frac{1}{5}\times15\right)\times\frac{2}{9}\)
\(=3\times\frac{2}{9}\)
\(=\frac{2}{3}\)
b\(\frac{4}{15}\times\frac{7}{15}\times\frac{5}{4}\)
\(=\left(\frac{4}{15}\times\frac{5}{4}\right)\times\frac{7}{15}\)
\(=\frac{1}{3}\times\frac{7}{15}\)
\(=\frac{7}{45}\)
c,\(\frac{21}{23}\times\frac{5}{11}\times\frac{44}{?}\)
d,\(26\times\frac{13}{42}\div13\)
\(=\left(26\div13\right)\times\frac{13}{42}\)
\(=2\times\frac{13}{42}\)
\(=\frac{13}{21}\)
-16 + 23 + x = -16
7 + x = -16
x = -16 - 7
x = -23
2x + 35 = -15
2x = -15 - 35
2x = -50
x = -25
-13 x |x | = -26
x = -26 : (-13)
x = 2
Vậy x = 2 hoặc -2
|2x - 5| = 13
2x = 13 + 5
2x = 18
x = 9
(x - 3) x (x + 2) = 0
\(\Leftrightarrow\orbr{\begin{cases}x-3=0\\x+2=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=3\\x=-2\end{cases}}\)
2)2x+35=-15
2x =-15-35
2x = -50
x =-25
1)-16+23+x=-16
7+x =-16
x =-16-7
x =-23
3)-13 * lxl =-26
lxl = -26:-13
lxl =2
<=>x=-2 hoac x=2
5) (x-3).(x+2) =0
<=>\(\orbr{\begin{cases}x-3=0\\x+2=0\end{cases}}\) <=>\(\orbr{\begin{cases}x=3\\x=-2\end{cases}}\)
1) 2763 +152 =2915
2) (-7) +(-14) = -21
3) (-35) + (-9) = -44
4) (-5) + (-248) = -253
5) (-23) + 105 = 82
6) 78 + (-123) = -45
7) 23 +(-13) = 10
8) (-23) +13 = -10
9) 26 + (-6) = 20
10) (-75) +50 = -25
11) 80 + (-220) = -140
12) (-23) + (-13) = -36
13) (-26) + (-6) = -32
14) (-75) + (-50) = -125
15) ❏-18❏ + (-12) = -17❏ -12
16)17 + ❏ - 33❏ = 17 -32❏
17) (-20) +❏ - 88❏ = -20 -87❏
18) ❏- 3❏+ ❏5❏ = ❏5❏ -2❏
19)❏-37❏+❏15❏ = ❏15❏ -36❏
20) ❏-37❏+(-❏15❏) = -❏15❏ - 36❏
21) (-❏-32❏) +❏5❏ = ❏5❏ -33❏
22) (-❏-22❏) + (-❏16❏) = -❏16❏ -23❏
23) (-23) +13 +(-17) +57 = 30
24) 14 +6 + (-9) + (-14) = -3
25) (-123 ) +❏-13❏+(-7) = -130-12❏
26) ❏0❏ + ❏45❏ +(-❏-455)❏+❏-796❏ = ❏45❏-❏\(^2\) -1250❏
a/ (71+x) - [(-24) - x] + [(-35) - x ]=71+x+24+x-35-x=x+60
b/ x - 34 - [(15 + x) - (23 - x)]=x-34-15-x-23+x=x-72
c/ 26 - [(-x) + 126 - 13) + [(-113) + x]=26+x-126+13-113+x=2x-200=2(x-100)
1,-16+23+x=-16
=>23+x=-16-16
=>23+x=-32
=>x=-32-23
=>x=-55
2,2x-35=15
=>2x=15+35
=>2x=50
=>x=25
3,3x+17=12
=>3x=12-17
=>3x=-5
=>ko có x thỏa mãn
4,|x-1|=0
=>x-1=0
=>x=1
5,-13.|x|=-26
=>|x|=-26:-13
=>|x|=2
=>x=2 hoặc -2
1. -16+23+x=-16
23+x=(-16)-(-16)
23+x=(-16)+16
23+x=0
x=0-23
x=-23
2. 2x-35=15
2x=15+35
2x=50
x=50:2
x=25
3. 3x+17=12
3x=12-17
3x=-5
x=(-5):3
x=-5/3
4. /x-1/=0
/x/=0+1
/x/=1
=>x=1 hoặc x=-1
5. -13./x/=-26
/x/=(-26):(-13)
/x/=2
=>x=2 hoặc x=-2
a)-16+23+x=-16
7+x=-16
x=-16-7
x=-23
b)2.x-35=15
2.x=15+35
2.x=50
x=50:2
x=25
c)3.x+17=12
3.x=12-17
3.x=-5
x=-5:3
x=-1,(6)
d)Ix-1I=0
IxI=0+1
IxI=1
=>x=1 hoặc x=-1
e)-13.IxI=-26
IxI=-26:(-13)
IxI=2
=>x=2 hoặc x=-2
x/13 + 15/26 = 23/26
x/13 = 23/26 - 15/26
x/13 = 8/26
x /13 = 4/13
x = 4
\(\frac{x}{13}+\frac{15}{26}=\frac{23}{26}\)
\(\Leftrightarrow\frac{x}{13}=\frac{8}{26}\)
\(\Leftrightarrow\frac{x}{13}=\frac{4}{13}\)
\(\Leftrightarrow x=4\)