a ) x = − 3 20 b ) x = 2 9 c ) x = − 1 8 d ) x = 9 4
a ) x = − 3 20 b ) x = 2 9 c ) x = − 1 8 d ) x = 9 4
Bài 1: Tìm x biết:
a) |x - 1| = 2x - 1
b) 2 |5-2x| -3 (x + 1) = 17
c) | | x - 2 |+ 3 | = 5
d) | 3 - 2x | = 3
Bài 2: Tìm x
a) | x - 1 | + | x + 2 | + | x - 3 | = 14
b) | x + 1 | + | x + 2 | + | x + 3 | + ... + | x + 10 | = 11x
c) | 39/2 - 3x^2 | = 15/2
d) | x + 4 | + | x + 10 | + | x + 101 | + | x + 999 | + | x + 1000 | = 2013
Bài 3: Tìm x
a) | x - 1 | < 5
b) | 1 - 2 x | < 3
c) | 2x + 3 | - 4 > 9
d) | 1/2 - x | + 3 > 7
Tìm x biết:
\(a,\dfrac{4}{5}+x=\dfrac{2}{3}\)
\(b,\dfrac{-5}{6}-x=\dfrac{2}{3}\)
\(c,\dfrac{1}{2}x+\dfrac{3}{4}=\dfrac{-3}{10}\)
\(d,\dfrac{x}{3}-\dfrac{1}{2}=\dfrac{1}{5}\)
\(e,\dfrac{x+3}{15}=\dfrac{1}{3}\)
\(h,x+30\%x=-1,3\)
\(k,3\dfrac{1}{3}x+16\dfrac{1}{4}=13,25\)
\(m,\dfrac{x-6}{2}=\dfrac{50}{x-6}\)
\(n,x-13,4=24,5-6,7.5,2\)
\(p,15,7x+3,6x=-96,5\)
\(q,2,5x-11,6=-59,1\)
tính :
a) 1/7 : 5/17 - 3/2 . ( 1/6 - 7/12 )
b) 25/77 - ( 1/5 - 7/15 ) : 10/11 : |-3/4|
c) 4/7 + 15/4 - 11/4 + 3/7 -1/2 + 1/3
tìm x biết :
a) 3/4 . x + 1/2 =3/5
b) x - 5/4 = 1/3 - 3/4 .x
c) -2/3 . ( x - 1/4 ) = 1/3 . ( 2x-1)
Bài 1. Tìm x,y ϵ Z biết:
a) xy - 2x - y = 1
b) y ( x - 1 ) - x = 8
c) xy - 3x + 2y = 11
d) 2/50 + 2/48 + 2/154 + ... + 2/x(x+3) = 202/1540
e) ( 1/ 1 . 2 . 3 . 4 + 1/ 2 . 3 . 4 . 5 + 1/ 3 . 4 . 5 . 6 + ... + 1/ 7 . 8 . 9 . 10 ) . x = 119/720
Trình bày đầy đủ nhé =)))))
Tìm x biết.
a,(3x-10)*-1/2x+5=0
b,-5x*(x+1/5)-1/2*(x+5)=-x+1/5
c,2*|1/2x-1/3|-3/2=1/4
d,|20/9-x|=1/12+1/20+1/30+1/42+1/56+1/72
e,1/2*3*x+1/3*4*x+1/4*5*x+.....+1/49*50*x=1
MÌNH CẦN GẤP.
Tìm x biết :
a, (2/3) - (5/3).x = 1/2.( 7/5.x + 5/3 )
b, 1/2.(x+2) - 4.(x - 1/4 ) = (1/2).x
c, (x-3).(x - 1/2) = 3.(1/3.x)
Tìm x thuộc Z, biết
a, -5/7 + 1 + 30/-7 <_ x <_ -1/6 + 1/3 + 5/6
b, 1/2 - ( 1/3 + 1/4 ) < x < 1/48 - ( 1/16 - 1/6 )
c, ( x - 1/2 ) × ( x + 3/4 ) < 0
d, 3/( x + 2) × ( x + 5 ) + 5/( x+5 ) × ( x +10) + 7/( x+10) × ( x+17) = x/( x+2) × ( x+17)
Tìm x biết: a) x + \(\dfrac{2}{3}=\dfrac{4}{27}\) b) \(\dfrac{3}{4}x-\dfrac{7}{3}=\dfrac{1}{4}x+\dfrac{1}{6}\)
c) \(\dfrac{13}{10}x-\dfrac{5}{2}=\dfrac{7}{2}\) d) (3\(x\) + 2) \(\left(\dfrac{-2}{5}x-7\right)=0\)
TÌM Y BIẾT:
a) y x 4/3= 16/9
b) (y-1/2)+0,5=3/4
c) 4/5-2/5 x y=0,2
d) (y+3/4)x5/7=10/9
e) y : 5/4=9/5+1/2
f) y x 1/2+3/2x y=4/5
1.Tìm x thuộc Z:
a)1+2+3+...+x=0
b)(x-1)+(x+1)+(x+2)+(x+3)+...+100=99
c)25.(x+5)=(7+3x)-(5x+4)
d)x.(x-1)-4(x+2)=3(2x-1)-x(4-x)
2.Tìm x thuộc Z:
a)(3-x).|3+x|=0
b)(x2+5).(x3+27)=0
c)(2x-4).(12-3x)>0
d)(x2-1).(x2+1).(x2+10).(x2+10).(x2+20)<0
3.Tìm a, b thuộc Z
a)a.(2b-1)=5
b)a2-a.b+b=7
c)a.(3b+1)+3(b-1)=10
d)2a+a.b-3b=11
Ai làm được câu nào thì cố giúp mình nhé mai phải nộp rồi!