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3./x-1/=96=>/x-1/=96/3=32
Xảy ra 2 trw hợp
Th1 x-1=32=>x=32+1=33
Th2 x-1=-32=>x=-32+1=-31
Vậy x=-31 hoặc x=33
2x+42=-20=>2x=-20-42=-62=>x=-62/2=-31
7x-12=37=>7x=37+12=49=>x=49/7=7
3./x-1/=96
/x-1/ = 96:3
/x-1/ = 32
=> x - 1= 32
x = 32+ 1
x = 33
=> x= 33 hoặc x = -33
a) \(170-x+56=100\)
\(\Rightarrow170-x=44\)
\(\Rightarrow x=170-44\)
\(\Rightarrow x=126\)
b) \(55:x+92,3=97,3\)
\(\Rightarrow55:x=97,3-92,3\)
\(\Rightarrow55:x=5\)
\(\Rightarrow x=\dfrac{55}{5}=11\)
c) \(\left(7x-24\right)-13,5=305,5\)
\(\Rightarrow7x-24=319\)
\(\Rightarrow7x=343\)
\(\Rightarrow x=\dfrac{343}{7}=49\)
a) 170-x+56=100
170 - x = 100 - 56
170 - x= 44
x= 170 - 44
x= 126
b)55:x+92,3=97,3
55:x = 97,3 - 92,3
55:x=5
x=55:5
x=11
c) (7.x-24)-13,5=305,5
(7.x - 24) = 305,5 + 13,5
7.x - 24= 319
7.x= 319 + 24
7.x= 343
x= 343:7
x= 49
`@` `\text {Ans}`
`\downarrow`
`2*x+3=8`
`=> 2x=8-3`
`=> 2x=5`
`=> x= 5 \div 2`
`=>`\(x=\dfrac{5}{2}\)
Vậy, `x=`\(\dfrac{5}{2}.\)
Bài 1: Tìm x
a) Ta có: \(-\frac{3}{4}-\left(x+\frac{1}{2}\right)=1\frac{2}{3}\)
\(\Leftrightarrow\frac{-3}{4}-x-\frac{1}{2}=\frac{5}{3}\)
\(\Leftrightarrow-x-\frac{5}{4}=\frac{5}{3}\)
\(\Leftrightarrow-x=\frac{5}{3}+\frac{5}{4}=\frac{35}{12}\)
hay \(x=-\frac{35}{12}\)
Vậy: \(x=-\frac{35}{12}\)
b) Ta có: \(3.15:0.4=2.1x:1.68\)
\(\Leftrightarrow\frac{63}{20}:\frac{2}{5}=\frac{21}{10}x:\frac{168}{100}\)
\(\Leftrightarrow x\cdot\frac{21}{10}:\frac{168}{100}=\frac{63}{8}\)
\(\Leftrightarrow x\cdot\frac{21}{10}=\frac{63}{8}\cdot\frac{168}{100}=\frac{1323}{100}\)
\(\Leftrightarrow x=\frac{1323}{100}:\frac{21}{10}=\frac{63}{10}\)
Vậy: \(x=\frac{63}{10}\)
\(a,45-\left(30+x\right)=x-\left(37-8\right)\)
\(\Leftrightarrow45-30-x=x-37+8\)
\(\Leftrightarrow-x-x=-37+8-45+30\)
\(\Leftrightarrow-2x=-44\)
\(\Leftrightarrow x=22\)
\(b,\left(x-12\right)-15=\left(30-8\right)-\left(40+x\right)\)
\(\Leftrightarrow x-12-15=30-8-40-x\)
\(\Leftrightarrow x+x=30-8-40+12+15\)
\(\Leftrightarrow2x=9\)
\(\Leftrightarrow x=4,5\)
a) x : 2,5 = 1/100
x = 1/250 * 2,5
x= 1/100
b) 5/3= x : 4/5
x= 4/5 * 5/3
x= 4/3
a) \(x\div2.5=0.003\div0.75\)
\(x\div2.5=0.004\)
\(x=0.004×2.5\)
\(x=0.01\)
Vậy, \(x=0.01\)
b) \(\frac{2}{3}\div0.4=x\div\frac{4}{5}\)
\(x\div\frac{4}{5}=\frac{5}{3}\)
\(x=\frac{5}{3}×\frac{4}{5}\)
\(x=\frac{20}{15}=\frac{4}{3}\)
Vậy, \(x=\frac{4}{3}\)
Cbht
a) x+2,5=3,15-0,4
x+2,5= 2,75
x= 2,75 - 2,5
x= 0,25
b)30 x( x:37)=2700
x:37= 2700:30
x:37 = 90
x= 90 x 37
x= 3330