x+1/15 + x+2/14 = x+5/11 + x+4/12
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a. 2(x-1) + (x+2) - (x+3) = 15 - (x+1)
=>2x-2+x+2-x-3=15-x-1
=>(2x+x-x)-2+2-3=15-1-x
=>2x-3=14-x
=>3x=17
=>x=17/3
b. x+1/15 + x+2/14 = x+4/12 + x+5/11
\(\Rightarrow\frac{x+1}{15}+1+\frac{x+2}{14}+1=\frac{x+4}{12}+1+\frac{x+5}{11}+1\)
\(\Rightarrow\frac{x+16}{15}+\frac{x+16}{14}=\frac{x+16}{12}+\frac{x+16}{11}\)
\(\Rightarrow\frac{x+16}{15}+\frac{x+16}{14}-\frac{x+16}{12}-\frac{x+16}{11}=0\)
\(\Rightarrow\left(x+16\right)\left(\frac{1}{15}+\frac{1}{14}-\frac{1}{12}-\frac{1}{11}\right)=0\)
\(\Rightarrow x+16=0\).Do \(\frac{1}{15}+\frac{1}{14}-\frac{1}{12}-\frac{1}{11}\ne0\)
=>x=-16
a) \(\dfrac{5}{8}:4\times\dfrac{1}{2}=\dfrac{5}{8}\times\dfrac{1}{4}\times\dfrac{1}{2}=\dfrac{5}{64}\)
b) \(\dfrac{7}{15}:\dfrac{14}{45}\times\dfrac{12}{11}=\dfrac{7}{15}\times\dfrac{45}{14}\times\dfrac{12}{11}=\dfrac{18}{11}\)
1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 x 9 x 10 x 11 x 12 x 13 x 14 x 15 = 1.3076744e+12
úm ba la xin tích
1) 10 - 3 ( x - 1 ) = -5
3 ( x - 1 ) = 10 - ( - 5 )
3 ( x - 1 ) = 15
x - 1 = 15 : 3
x - 1 = 5
x = 5 + 1
x = 6
2) 3x + 75 = - 15
3x = - 15 - 75
3x = - 90
x = -90 : 3
x = -30
4) 12 - ( x - 7 ) = - 8
x - 7 = 12 - (- 8 )
x - 7 = 20
x = 20 + 7
x = 27
5) x + 75 = 15
x = 15 - 75
x = -60
7) 2x + 18 = 10
2x = 10 - 18
2x = -8
x = - 8 : 2
x = -4
8) 26 - 3x = 5
3x = 26 - 5
3x = 21
x = 21: 3
x = 7
9) x - 12 = - 15
x = -15 + 12
x =-3
10 ) 24 - 2 ( x + 5 ) = 38
2 ( x+ 5 ) = 24 - 38
2 ( x + 5 ) = - 14
x + 5 = -14 : 2
x + 5 = -7
x = -7 - 5
x = -12
còn là bạn tự làm tiếp nhé ! bạn gửi nhiều cầu qua bạn chỉ nên gửi ít một thời như vậy khó có thể giải làm bạn ạ!
a: \(A=\dfrac{-7}{28}\cdot\dfrac{15}{25}=\dfrac{-1}{4}\cdot\dfrac{3}{5}=\dfrac{-3}{20}\)
b: \(B=\dfrac{-5\cdot7}{14\cdot\left(-3\right)}=\dfrac{35}{42}=\dfrac{5}{6}\)
c: \(C=\dfrac{-1}{5}-\dfrac{1}{5}\cdot\dfrac{3}{5}=\dfrac{-1}{5}-\dfrac{3}{25}=\dfrac{-8}{25}\)
d: \(D=\dfrac{-3}{4}-\dfrac{1}{4}=-1\)
e: \(E=\dfrac{-4}{5}\left(1-\dfrac{15}{16}\right)=\dfrac{-4}{5}\cdot\dfrac{1}{16}=\dfrac{-1}{20}\)
f: \(F=\dfrac{6-7}{4}\cdot\dfrac{4+12}{22}=\dfrac{-1}{4}\cdot\dfrac{8}{11}=\dfrac{-2}{11}\)
\(\frac{x+1}{15}+\frac{x+2}{14}=\frac{x+5}{11}+\frac{x+4}{12}\)
\(\Leftrightarrow\frac{x+1}{15}+\frac{x+2}{14}+2=\frac{x+5}{11}+\frac{x+4}{12}+2\)
\(\Leftrightarrow\left(\frac{x+1}{15}+1\right)+\left(\frac{x+2}{14}+1\right)=\left(\frac{x+5}{11}+1\right)+\left(\frac{x+4}{12}+1\right)\)
\(\Leftrightarrow\frac{x+1+15}{15}+\frac{x+2+14}{14}=\frac{x+5+11}{11}+\frac{x+4+12}{12}\)
\(\Leftrightarrow\frac{x+16}{15}+\frac{x+16}{14}=\frac{x+16}{11}+\frac{x+16}{12}\)
\(\Leftrightarrow\frac{x+16}{15}+\frac{x+16}{14}-\frac{x+16}{11}-\frac{x+16}{12}=0\)
\(\Leftrightarrow\left(x+16\right)\left(\frac{1}{15}+\frac{1}{14}-\frac{1}{11}-\frac{1}{12}\right)=0\)
\(\Leftrightarrow x+16=0\)
\(\Leftrightarrow x=-16\)
\(\frac{x+1}{15}+\frac{x+2}{14}=\frac{x+5}{11}+\frac{x+4}{12}\)
=>\(\frac{x+1}{15}+1+\frac{x+2}{14}+1=\frac{x+5}{11}+1+\frac{x+4}{12}+1\)
=>\(\frac{x+1}{15}+\frac{15}{15}+\frac{x+2}{14}+\frac{14}{14}=\frac{x+5}{11}+\frac{11}{11}+\frac{x+4}{12}+\frac{12}{12}\)
=>\(\frac{x+1+15}{15}+\frac{x+2+14}{14}=\frac{x+5+11}{11}+\frac{x+4+12}{12}\)
=>\(\frac{x+16}{15}+\frac{x+16}{14}=\frac{x+16}{11}+\frac{x+16}{12}\)
=>\(\frac{x+16}{15}+\frac{x+16}{14}-\frac{x+16}{11}-\frac{x+16}{12}\)=0
=>\(\left(x+16\right).\left(\frac{1}{15}+\frac{1}{14}-\frac{1}{11}-\frac{1}{12}\right)=0\)
Mà \(\frac{1}{15}+\frac{1}{14}-\frac{1}{11}-\frac{1}{12}\ne0\)
=>x+16=0
=>x =0-16
=>x =-16
Vậy x=-16
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