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a, 5(x – 7) = 0
x – 7 = 0
x = 7
b, 95 – 5(x+2) = 45
5(x+2) = 40
x+2 = 8
x = 6
c, 6 2 x + 2 3 + 40 = 100
6(2x+8) = 60
2x+8 = 10
x = 1
d, 3(3x+9)+6 = 96
3(3x+9) = 90
3x+9 = 30
3x = 27
x = 9
e, 2 6 + 5 + x = 3 4
5+x = 81–64
5+x = 17
x = 12
a ) x = − 4 5 − 1 2 ⇔ x = − 13 10 b ) x = − 3 4 − 2 3 ⇔ x = − 17 12 c ) − 3 5 : x = − 2 3 − 2 3 5 ⇔ − 3 5 : x = − 49 15 ⇔ x = − 3 5 : − 49 15 ⇔ x = 9 49
a) \(\frac{7}{13}x\frac{7}{15}-\frac{5}{12}x\frac{21}{39}+\frac{49}{91}x\frac{8}{15}=\frac{7}{13}x\frac{7}{15}-\frac{5}{12}x\frac{7}{13}+\frac{7}{13}x\frac{8}{15}\)
\(=\frac{7}{13}x\left(\frac{7}{15}-\frac{5}{12}+\frac{8}{15}\right)=\frac{7}{13}x\left(1-\frac{5}{12}\right)=\frac{7}{13}x\frac{7}{12}=\frac{49}{156}\)
b) \(\left(\frac{12}{199}+\frac{23}{200}-\frac{34}{201}\right)x\left(\frac{1}{2}-\frac{1}{3}-\frac{1}{6}\right)=\left(\frac{12}{199}+\frac{23}{200}-\frac{34}{201}\right)x0=0\)
Bài 2:
a) \(0,5+\left(x-\frac{15}{2}\right):\frac{1}{2}=\frac{9}{2}\)
\(\left(x-\frac{15}{2}\right):\frac{1}{2}=4\)
\(x-\frac{15}{2}=2\)
x = 19/2
b) \(2012\times x-2010\times x=2014\)
\(x\times\left(2012-2010\right)=2014\)
\(x\times2=2014\)
x = 1007
c) ( x + 1) + (x+2) + (x+3)+...+(x+100) = 5750
\(x\times100+\left(1+2+3+...+100\right)=5750\)
\(x\times100+5050=5750\)
\(x\times100=700\)
x = 7
a) \(x+546=46\\ x=46-546\\ x=-500\)
b) \(2x-19\times3=27\\ 2x-57=27\\ 2x=27+57\\ 2x=84\\ x=84:2\\ x=42\)
c) \(x+12=23+3\times3^4\\ x+12=23+3\times81\\ x=23+243-12\\ x=254\)
d) \(x-12=3-3\times2^4\\ x-12=3-3\times16\\ x=3-48+12\\ x=-33\)
e) \(\left(27-x\right)\left(x+9\right)=0\\ \Rightarrow\left[{}\begin{matrix}27-x=0\\x+9=0\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x=27\\x=-9\end{matrix}\right.\)
f) \(\left(-x\right)\left(x-43\right)=0\\ \Rightarrow\left[{}\begin{matrix}-x=0\\x-43=0\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x=0\\x=43\end{matrix}\right.\)
(x+4).(23-x)=0
=>x+4=0 hoặc 23-x=0
x=0-4 x=23-0
x=-4 x=23
mà x là số tự nhiên nên x=23
a) ! x ! + 23 = 45
! x ! = 45 - 23
! x ! = 22
-> x = 22 hoặc x = -22
b) ! x + 2 ! - 32 = 34
! x + 2 ! = 34 + 32
! x + 2 ! = 66
-> x + 2 = 66 hoặc x + 2 = -66
Nếu x + 2 = 66 thì Nếu x + 2 = -66
x = 66 - 2 = 64 x = -66 - 2 = -68
c) 234 + ( 34 - 23 ) + x = 546
234 + 11 + x = 546
245 + x = 546
x = 546 - 245
x = 301
a) \(\left|x\right|+23=45\)
\(\left|x\right|=45-23\)
\(\left|x\right|=22\)
\(\Rightarrow\orbr{\begin{cases}x=22\\x=-22\end{cases}}\)
vậy \(\orbr{\begin{cases}x=22\\x=-22\end{cases}}\)
b) \(\left|x+2\right|-32=34\)
\(\left|x+2\right|=34+32\)
\(\left|x+2\right|=66\)
\(\Rightarrow\orbr{\begin{cases}x+2=66\\x+2=-66\end{cases}}\Rightarrow\orbr{\begin{cases}x=64\\x=-68\end{cases}}\)
vậy \(\orbr{\begin{cases}x=64\\x=-68\end{cases}}\)
c) \(234+\left(34-23\right)+x=546\)
\(11+x=546-234\)
\(x=312-11\)
\(x=301\)
vậy \(x=301\)
a, 12 + x = 34
x = 34 - 12
x = 22
b, 23 + x = 34
x = 34 - 23
x = 11
c, 45 + 34 = x
x = 79
Mấy cái này giống tìm x có đúng ko hay khác :VVV
Thì đề ghi lak Tìm x mà má :V