Tìm x:
-x-15=-13
Tìm x biết: (13-x) + (15-x) + (13-x) +.....+(1-x)=0
tìm X
3/2*X-3/2=1/2
8/13*X+5/13*X=1/10
2/15+7/15*X=1/15
hộ mik nha
a)\(2.x-\frac{3}{2}=\frac{1}{2}\)
\(2x=\frac{4}{2}\)
\(x=\frac{4}{2}:2\)
\(x=1\)
Vậy x=1
b)\(\frac{8}{13}.x+\frac{5}{13}.x=\frac{1}{10}\)
\(x.\left(\frac{8}{13}+\frac{5}{13}\right)=\frac{1}{10}\)\
\(x.1=\frac{1}{10}\)
\(x=\frac{1}{10}\)
Vậy x=\(\frac{1}{10}\)
c)\(\frac{2}{15}+\frac{7}{15}.x=\frac{1}{15}\)
\(\frac{7}{15}x=\frac{-1}{15}\)
x=\(\frac{-1}{7}\)
Vậy \(x=\frac{-1}{7}\)
\(\frac{3}{2}\cdot x-\frac{3}{2}=\frac{1}{2}\) \(\frac{8}{13}\cdot x+\frac{5}{13}\cdot x=\frac{1}{10}\)
\(\frac{3}{2}\cdot x=\frac{3}{2}+\frac{1}{2}=2\) \(\left[\frac{8}{13}+\frac{5}{13}\right]\cdot x=\frac{1}{10}\)
\(x=2:\frac{3}{2}\) \(1\cdot x=\frac{1}{10}\)
x=\(\frac{4}{3}\) \(x=\frac{1}{10}:1\)
Vậy x=\(\frac{4}{3}\) \(x=\frac{1}{10}\)
Vậy x=\(\frac{1}{10}\)
c,\(\frac{2}{5}+\frac{7}{15}\cdot x=\frac{1}{15}\)
\(\frac{7}{15}\cdot x=\frac{1}{15}-\frac{2}{5}=\frac{-1}{3}\)
\(x=\frac{-1}{3}:\frac{7}{15}\)
\(x=\frac{-5}{7}\)
Vậy x=\(\frac{-5}{7}\)
tìm x thuộc Z :
b, 17 - ( - x + 13 ) + ( x - 15 ) = 13 + x - 18
17 - ( - x + 13 ) + ( x - 15 ) = 13 + x - 18
17 + x - 13 + x - 15 = 13 + x - 18
x + x - x = 13 - 18 -17 + 13
=> x = -9
Vậy...
Chúc em học tốt!!!
17-(-x+13)+(x-15)=13+x-18
17+x-13+x-15=13+x-18
2x-11=x-5
2x-x=-5+11
x=6
Vậy x=6
Chúc bạn học tốt!!!
\(17-\left(-x+13\right)+x-15=13+x-18\)
\(\Rightarrow17+x-13+x-15=13+x-18\)
\(\Rightarrow x+x-x=13-18+15+13-17\)
\(x=6\)
\(\Rightarrow x=\frac{7}{2}\)
1/13-(5/42-x)=-(15/28-11/13). Tìm x
\(\frac{1}{13}-\left(\frac{5}{42}-x\right)=-\left(-\frac{113}{364}\right)\)
=>\(\frac{1}{13}-\frac{5}{42}+x=\frac{113}{364}\)
=>\(-\frac{23}{546}+x=\frac{113}{364}\)
=>\(x=\frac{113}{364}-\left(-\frac{23}{546}\right)\)
=>\(x=\frac{113}{364}+\frac{23}{546}\)
=>\(x=\frac{55}{156}\)
Tìm Y:
Y x 16/64 + Y x 25/100 + Y x 1/4 + Y x 15/60 - 13/15 = 17/15
y \(\times\) \(\dfrac{16}{64}\) + y \(\times\) \(\dfrac{25}{100}\) + y \(\times\) \(\dfrac{1}{4}\) + y \(\times\) \(\dfrac{15}{60}\) - \(\dfrac{13}{15}\) = \(\dfrac{17}{15}\)
y \(\times\) ( \(\dfrac{1}{4}\) + \(\dfrac{1}{4}\) + \(\dfrac{1}{4}\)+ \(\dfrac{1}{4}\)) - \(\dfrac{13}{15}\) = \(\dfrac{17}{15}\)
y = \(\dfrac{17}{15}\) + \(\dfrac{13}{15}\)
y = \(\dfrac{30}{15}\)
y = 2
Cái này bằng rủ em chơi oẳn tù tì ,em ra lá còn anh ra hôn má em
me nhìn công thức của cô Hoài moà đâu đầu nun á
tìm số hữu tỉ x , biết ; x+2/11+x+2/13+x+3/13=x+2/14+x+2/15
bạn viết sai đề bài nhé
(x+2)/11+(x+2)/12+(x+2)/13=(x+2)/14+(x+2)15
<=> (x+2)/11+(x+2)/12+(x+2)/13 - (x+2)/14 - (x+2)/15 = 0
<=> (x+2)(1/11+1/12+1/13 - 1/14 - 1/15 ) = 0
vì: (1/11+1/12+1/13 - 1/14 - 1/15 ) khác 0 nên x-2 = 0 => x=2
Tìm x biết
x-11/13=15/13
\(x=\dfrac{15}{13}+\dfrac{11}{13}=\dfrac{15+11}{13}=\dfrac{26}{13}\)
\(x=\dfrac{15}{13}+\dfrac{11}{13}\\ x=\dfrac{26}{13}\)
Tìm x thuộc N biết :
x-20/11*13-20/13*15-20/15*17 -... - 20/33*35 = 3/11
Tìm x thuộc N biết :
x-20/11*13-20/13*15-20/15*17-...-20/53*55=3/11