Tìm x biết x + 20%x = 120
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a) 120 - 20 : x = 110
20:x= 120 - 110
20:x= 10
x= 20:10=2
b) 213 - ( x - 13 ) = 1442 : 14
213 - (x-13)=103
x-13= 213 - 103
x-13=110
x=110+13
x=123
c) 2550 : [ 120 - ( x - 5 ) ] = 25
120 - (x-5) = 2550:25
120 - (x-5)=102
x-5 = 120 - 102
x-5= 18
x=18+5
x=23
a) x - 120: 30 = 40
x -40 =40
x =40+40
x =80
b) (x + 120) : 20 = 8
(x+ 120) = 8x20
x+120 =160
x = 160-120
x = 40
c) (x + 5). 3 = 300
x+5=300:3
x+5=100
x=100-5
x=95
d) x.2 + 21 : 3= 27
x.2 +7=27
x.2 = 27-7
x.2= 20
x=20:2
x=10
\(x\in BC\left(20;120;56\right)\)
\(\Leftrightarrow x=840\)
a. 20 + 8.(x + 3) = 52 . 4
8.(x + 3) = 100 - 20
x + 3 = 80 : 8
x = 10 - 3
x = 7
b. 120 + |x| = 150
|x| = 150 - 120
|x| = 30
x = + 30
a) 20 + 8(x + 3) = 52 . 4
20 + 8(x + 3) = 100
8(X + 3) = 100 - 20
8(x + 3) = 80
x + 3 = 80 : 8
x + 3 = 10
x = 10 - 3
x = 7
b) 120 + |x| = 150
|x| = 150 - 120
|x| = 30
=> \(\orbr{\begin{cases}x=30\\x=-30\end{cases}}\)
Lớp 6 rồi mà gà quá :v
Ta có:
10+20+30=(120:(x-6)+24)
=>(120:(x-6)+24)=60
=> 120:(x-6)=36
=> x-6=10/3
=> x=28/3
Ta có :
10 + 20 = 30 = [ 120 : ( x - 6 ) + 24 ]
Suy ra [ 120 : ( x - 6 ) + 24 ] = 60
Suy ra 120 : ( x - 6 ) = 36
Suy ra x - 6 = 10/3
Suy ra x = 28/3
`@` `\text {Ans}`
`\downarrow`
`a,`
`(x-1954) \times 5=50`
`x-1954 = 50 \div 5`
`x-1954 = 10`
`x=10 + 1954`
`x= 1964`
`B.`
`48 - 40 \times x=8`
`40 \times x=48-8`
`40 \times x = 40`
` x=40 \div 40`
`x=1`
`C.`
`2+70 \div x = 3`
`70 \div x = 3-2`
`70 \div x = 1`
`x=70 \div 1`
`x=70`
`D. [3 \times (x+2) \div 7] \times 4=120`
`3 \times (x+2) \div 7 = 120 \div 4`
`3 \times (x+2) \div 7 =30`
`3 \times (x+2) = 30 \times 7`
`3 \times (x+2)=210`
`x+2=210 \div 3`
`x+2=70`
`x=70-2`
`x=68`
`E.`
`7,2 \div [ (0,6 \times x+8) \div 20 + 59] = 0,12?` Thiếu ngoặc bạn nhé._.
\(a,\left(x-1954\right)\times5=50\\ x-1954=50:5\\ x-1954=10\\ x=1954+10\\ x=1964\\b.48-40\times x=8\\40\times x=48-8\\40\times x=40\\ x=40:40\\ x=1 \\ c.2+70:X=3\\ 70:x=3-2\\ 70:x=1\\ x=70:1\\ x=70\\ d,\left[3\times\left(x+2\right):7\right]\times4=120\\ 3\times\left(x+2\right):7-120:4\\ 3\times\left(x+2\right):7=30\\ \left(x+2\right):7=30:3\\ \left(x+2\right):7=10\\ x+2=10\times7\\ x+2=70\\ x=70-2\\ x=68\)
x + 20%x =120
x*1 +20%x =120
x*(1+20%) =120
x*1,2 =120
x =120/1,2
x = 100
\(x+20\%x=120\)
\(\Rightarrow x+\frac{1}{5}x=120\)
\(\Rightarrow x.\left(1+\frac{1}{5}\right)=120\)
\(\Rightarrow x.\frac{6}{5}=120\)
\(\Rightarrow x=120:\frac{6}{5}\)
\(\Rightarrow x=100\)