a)11(x-6)=4x+11
11x - 11*6=4x+11
11x-4x=11+11*6
7x=77
x=77/7
x=11
b)lx-3l+1=x
lx-3l=x-1
\(\Rightarrow x-3\in\left\{-\left(x-1\right);x-1\right\}\)
Ta có:
TH1:x-3=-(x-1)
x-3=-x+1
x-(-x)=1+3
2x=4
x=4/2
x=2
TH2:x-3=x-1
x-x=3-1
0=2
\(x\in rỗng\)
Vậy x=2
a)11(x-6)=4x+11
11x - 11*6=4x+11
11x-4x=11+11*6
7x=77
x=77/7
x=11
b)lx-3l+1=x
lx-3l=x-1
\(\Rightarrow x-3\in\left\{-\left(x-1\right);x-1\right\}\)
Ta có:
TH1:x-3=-(x-1)
x-3=-x+1
x-(-x)=1+3
2x=4
x=4/2
x=2
TH2:x-3=x-1
x-x=3-1
0=2
\(x\in rỗng\)
Vậy x=2
Bài 2: Tìm x
a) x - 2/11 = -5/11
b) x - 1/24 = -1/8 + 5/6
c) 5/8 - x = 1/9 - (-5/4)
d) 8/23 . 46/24 - x = 1/3
e) 1/5 : x = 1/5 + 1/7
Tìm x, y ∈ Z biết:
a, (x - 3)(y + 5) = 11
b, (2x + 1)(6 - y) = 12
Tìm x
a,(4x-5).(\(\dfrac{5}{4}\)x-2)=0 b,(\(\dfrac{1}{12}\)+\(3\dfrac{1}{6}\)-30,75)x-8=(\(\dfrac{3}{5}\)+0,415+\(\dfrac{1}{200}\)):0,01
Tìm x
a) -1/2 . x = 5
b) x-1/9 = 8/3
c) x + 5/6 = 16/42 - -8/56
d) 1 3/4x - 5 = -3 1/3
e) 3 1/3 - 3/4 : x = -1/6
g) 3/x + 5 = 15%
h) 1/2 + 1/2.3 + 1/3.4 +...+1/x(x+1) = 49/50
Tìm x
a) -1/2 . x = 5
b) x-1/9 = 8/3
c) x + 5/6 = 16/42 - -8/56
d) 1 3/4x - 5 = -3 1/3
e) 3 1/3 - 3/4 : x = -1/6
g) 3/x + 5 = 15%
h) 1/2 + 1/2.3 + 1/3.4 +...+1/x(x+1) = 49/50
1.tính tổng các x
a) - 7 < x<11
b) - 15 \(\le x\le14\)
c)-2002 \(\le x\le2003\)
Tìm x
a. (4\(x\)+5) :3 -121 :11=14
b. 2+4+6+..... +\(x\) =2450 (\(x\) chẵn)
c. 1\(x\)32 +7\(x\)8 +4\(x\)=200\(x\)
d.2\(x\)+3\(x\)=1505
Cần gấp ạ
Bài 1 Tính
25/42 - 20/63
9/20 - 13/75 - 1/6
Bài 2 Tính tổng sau bằng một cách hợp lí
A= 5/7 cộng 8/11 cộng [-2/7] cộng 1/2 cộng 3/11
B= 11/17 cộng [-8/19] cộng [-3/4] cộng 6/17 -30/19
C= 1/1 x 2 cộng 1/2 x 3 cộng 1/3 x 4 ...... cộng 1/49 x50
Tìm x
a, (x-2)^5=(x-2)^3
b,(x-3)^3=(x-3)^2 c,11.6^x-1+2.6^x+1 =11.6^11+2.6^13
d, 6.8^x-1+8^x-1=6.8^19+8^21