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a) \(\dfrac{5}{8}-\left(x+\dfrac{3}{4}\right)=\dfrac{7}{6}\)
\(-x-\dfrac{3}{4}=\dfrac{13}{24}\)
\(-x=\dfrac{31}{24}\)
\(\Rightarrow x=\dfrac{-31}{24}\)
b) \(\left(x-\dfrac{3}{4}\right)+\dfrac{3}{2}=\dfrac{11}{3}\)
\(x-\dfrac{3}{4}=\dfrac{13}{6}\)
\(x=\dfrac{35}{12}\)
c) \(\left(x+\dfrac{1}{2}\right)-\dfrac{5}{8}=2\)
\(x+\dfrac{1}{2}=\dfrac{21}{8}\)
\(x=\dfrac{17}{8}\)
d) \(\dfrac{11}{2}-\left(\dfrac{4}{5}+x\right)=2-\dfrac{1}{3}\)
\(\dfrac{11}{2}-\left(\dfrac{4}{5}+x\right)=\dfrac{5}{3}\)
\(-\dfrac{4}{5}-x=\dfrac{-23}{6}\)
\(-x=\dfrac{-91}{30}\)
\(\Rightarrow x=\dfrac{91}{30}\)
`5/8-(x+3/4)=7/6`
`=> x+3/4 = 5/8 -7/6`
`=> x+3/4 = -13/24`
`=>x= -13/24 -3/4`
`=>x= -13/24 - 18/24`
`=>x= -31/24`
`-----------`
`(x-3/4)+3/2+11/3`
`=11/3` hả bn?
`----------`
`(x+1/2)-5/8=2`
`=>x+1/2=2+5/8`
`=>x+1/2= 16/8+5/8`
`=> x+1/2=21/8`
`=>x=21/8-1/2`
`=>x= 21/8 - 4/8`
`=>x= 17/8`
`---------`
`11/2-(4/5+x)=2-1/3`
`=> 11/2-(4/5+x)=6/3-1/3`
`=> 11/2-(4/5+x)=5/3`
`=>4/5+x=11/2-5/3`
`=>4/5+x=23/6`
`=>x=23/6-4/5`
`=>x= 91/30`
a) (x + 23) - 14 = 11
=> x + 23 - 14 = 11
=> x + 9 = 11
=> x = 11 - 9 = 2
b) 2.x + 13 = 43
=> 2.x = 43 - 13
=> 2.x = 30
=> x = 15
c) 2(x - 1) - 156 = 196
=> 2x - 2 = 352
=> 2x = 354
=> x = 177
3(134 - x) + 1 = 211
=> 3(134 - x) = 210
=> 134 - x = 70
=> x = 134 - 70 = 64
h) 156 - 2(x + 2) = 128
=> 2(x + 2) = 156 - 128 = 28
=> x + 2 = 28 : 2
=> x + 2 = 14
=> x = 12
\(\frac{217-x}{207}+\frac{215-x}{209}+\frac{213-x}{211}+\frac{211-x}{213}+4=0\)
\(\Leftrightarrow\)\(\left(\frac{217-x}{207}+1\right)+\left(\frac{215-x}{209}+1\right)+\left(\frac{213-x}{211}+1\right)+\left(\frac{211-x}{213}+1\right)=0\)
\(\Leftrightarrow\)\(\frac{424-x}{207}+\frac{424-x}{209}+\frac{424-x}{211}+\frac{424-x}{213}=0\)
\(\Leftrightarrow\)\(\left(424-x\right)\left(\frac{1}{207}+\frac{1}{209}+\frac{1}{211}+\frac{1}{213}\right)=0\)
\(\Leftrightarrow\)\(424-x=0\) (do 1/207 + 1/209 + 1/211 + 1/213 # 0)
\(\Leftrightarrow\)\(x=424\)
Vậy...
ghi cả cách giải nữa chứ,ghi mỗi đáp án thì làm sao hiểu được
\(3\left(x-2\right)=-100+211\\ 3\left(x-2\right)=111\\ x-2=37\\ x=39.\)
`#3107.101107`
`3(x - 2) = -100 + 211`
`\Rightarrow 3(x - 2) = 111`
`\Rightarrow x - 2 = 111 \div 3`
`\Rightarrow x - 2 = 37`
`\Rightarrow x = 37 + 2`
`\Rightarrow x = 39`
Vậy, `x = 39.`