Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(5\frac{1}{2}-5\frac{1}{3}.\left(\frac{3}{2}.x-\frac{1}{3}\right)=1\frac{1}{2}\)
\(\frac{16}{3}\left(\frac{3}{2}.x-\frac{1}{2}\right)=5\frac{1}{2}-1\frac{1}{2}=4\)
\(\frac{3}{2}x-\frac{1}{2}=4:\frac{16}{3}=\frac{4}{3}\)
\(\frac{3}{2}x=\frac{4}{3}+\frac{1}{2}=\frac{11}{6}\)
\(x=\frac{11}{6}:\frac{3}{2}\)
\(x=\frac{11}{9}\)
\(a,A=\frac{x-4}{x+1}=\frac{(x+1)-1-4}{x+1}=1-\frac{5}{x+1}\)
Để \(x\in Z\)thì \(x+1\inƯ(5)\)
mà \(Ư(5)=(5;1;-1;-5)\)
Ta có bảng sau
x + 1 | 5 | 1 | -1 | -5 |
x | 4 | 0 | -2 | -6 |
Vậy \(x=(4;0;-2;-6)\)
\(b,B=\frac{3x-5}{x-2}=\frac{3x-6+1}{x-2}=\frac{3x-6}{x-2}+\frac{1}{x-2}=\frac{3(x-2)}{x-2}+\frac{1}{x-2}=3+\frac{1}{x-2}\)
Để \(x\in Z\)thì \(x-2\inƯ(1)\)
mà \(Ư(1)=(1;-1)\)
Với \(x-2=1\Rightarrow x=3\)
Với \(x-1=-1\Rightarrow x=0\)
Vậy \(x=(3;0)\)
Chúc bạn học tốt nhé
\(A=\frac{x-4}{x+1}=\frac{x+1-5}{x+1}=\frac{-5}{x+1}\)
\(\Rightarrow x+1\inƯ\left(5\right)=\left\{\pm1;\pm5\right\}\)
Ta lập bảng :
x + 1 | 1 | -1 | 5 | -5 |
x | 0 | -2 | 4 | -6 |
Vì \(x\inℤ\)thì x ta tìm đc tm
\(B=\frac{3x+5}{x-2}=\frac{3\left(x-2\right)+11}{x-2}=\frac{11}{x-2}\)
\(\Rightarrow x-2\inƯ\left(11\right)=\left\{\pm1;\pm11\right\}\)
Ta lập bảng :
x - 2 | 1 | -1 | 11 | -11 |
x | 3 | 1 | 13 | -9 |
Vì x\(\inℤ\)nên x ta tìm đc tm
câu a+b dùng quy tắc chuyển vế
c, 3.(1/2-x)-5.(x-1/10)=-7/4
=>(3.1/2-3x)-(5x-5.1/10)=-7/4
=>3/2-3x-5x+1/2=-7/4
=>(3/2+1/2)-(3x+5x)=-7/4
=> 2-8x=-7/4
=>8x=15/4
=>x=15/4:8
=>x=15/32
a) 2.(1/4 - 3x) = 1/5 - 4x
=> 1/2 - 6x = 1/5 -4x
=> -6x + 4x = 1/5 - 1/2
=> -2x = -3/10 = 3/20
b) 4.(1/3 - x) + 1/2 = 5/6 +x
=> 4/3 - 4x + 1/2 = 5/6 +x
=> -4x - x = 5/6 - 4/3 - 1/2
=> -5x = -1
=> x= 1/5
c) 3. (1/2 - x) -5. ( x - 1/10) = -7/4
=> 3/2 - 3x - 5x + 1/2 = -7/4
=> -3x - 5x = -7/4 - 3/2 - 1/2
=> -8x = -15/4
=> x = 15/32
\(\left(3x-2\right)^3\cdot4=256\)
\(\left(3x-2\right)^3=256:4\)
\(\left(3x-2\right)^3=64\)
\(\left(3x-2\right)^3=4^3\)
\(\Rightarrow3x-2=4\)
\(3x=4+2\)
\(3x=6\)
\(x=6:3\)
\(x=2\)
\(\dfrac{3}{7}+\left(-\dfrac{5}{2}\right)+\left(-\dfrac{3}{5}\right)=\dfrac{30}{70}+\left(-\dfrac{175}{70}\right)+\left(-\dfrac{42}{70}\right)=-\dfrac{187}{70}\)
\(\dfrac{3}{7}+\left(-\dfrac{5}{2}\right)+\left(-\dfrac{3}{5}\right)=\dfrac{3}{7}-\dfrac{5}{2}-\dfrac{3}{5}\)
\(=\dfrac{30}{70}-\dfrac{175}{70}-\dfrac{42}{70}=-\dfrac{187}{70}\)
x.(0,5-2/3)=7/12
x.-1/6 =7/12
x =7/12:-1/6
x = -7/2
k mk nha bạn!! thanks nhìu!!
\(\left(3x-2\right)^5=243\)
\(\left(3x-2\right)^5=3^5\)
\(\Rightarrow3x-2=3\)
\(\Rightarrow3x=5\)
\(\Rightarrow x=\frac{5}{3}\)
vậy \(x=\frac{5}{3}\)
tiểu thư song ngư học tốt
( 3x - 2 )5 = 243
( 3x -2 )5 = 35
=> 3x - 2 = 3
=> 3x = 5
=> x = 5/3