tìm x biết a)x^3+x/1^3=13(x+(1/x))
b)(x-3)^3+(x+1)^3=8(x-1)^3
bài 2 . thực hiện phép tính
a. -1,75-(-1/9-2 1/18)
b. -1/12- (2 5/8-1/3)
c. -5/6-(-3/8+1/10)
Bài 3 :tìm x ,biết :
a. 11/13-(5/42-x)=(-15/28-11/13)
b. x+1/3=2/5-(-1/3)
c. 3/7-x=1/4-(-3/5)
a.-1,75-(-\(\dfrac{1}{9}\)-2\(\dfrac{1}{8}\))
-1,75-\(\dfrac{1}{9}+\dfrac{17}{8}\)
\(-\dfrac{7}{4}-\dfrac{1}{9}+\dfrac{17}{8}\)
\(\dfrac{-126}{72}-\dfrac{8}{72}+\dfrac{153}{72}\)
=\(\dfrac{19}{72}\)
b.\(\dfrac{-1}{12}-\left(2\dfrac{5}{8}-\dfrac{1}{3}\right)\)
\(\dfrac{-1}{12}-\left(\dfrac{21}{8}-\dfrac{1}{3}\right)\)
\(\dfrac{-1}{12}-\dfrac{21}{8}+\dfrac{1}{3}\)
\(\dfrac{-2}{24}-\dfrac{63}{24}+\dfrac{64}{24}\)
=\(\dfrac{-1}{24}\)
\(\dfrac{-5}{6}-\left(\dfrac{-3}{8}+\dfrac{1}{10}\right)\)
\(\dfrac{-5}{6}-\dfrac{-3}{8}-\dfrac{1}{10}\)
Tìm số nguyên x, biết 13 ⋮ (2x + 3)
A. x ∈ {1; -1; 13; -13} B. x ∈ {1; 13}
C. x ∈ {-1; 5; -2; -8} D. x ∈ {1; 2; 5; 8}
Tìm x ∈ Z thỏa mãn; -1 < x < 2
A. x ∈ {0} B. x ∈ {-1;0;1;2} C. x ∈ {0;1} D. x ∈ {0;1;2}
Sắp xếp các số 0;-12; -4; 9; 234; -234 theo thứ tự giảm dần, chọn câu đúng?
A. 234; 0; 9; -4; -12; -234 B. -234; -4; 0; -12; 9; 234
C. -234; -12; -4; 0; 9; 234 D. 234; 9; 0; -4; -12; -234
Tìm x ,biết A,2.x(x+1)-135=-200 B,4.x-5.(x-1)+15=13 C,2/3.x-1/4=3/5-7/8 D,1/2.(2.x-3)+105/2=-137/2
a: 2x(x+1)-135=-200
=>2(x^2+x)=-65
=>2x^2+2x+65=0
=>x^2+x+32,5=0
=>x^2+x+0,25+32,25=0
=>(x+0,5)^2+32,25=0(vô lý)
b: 4x-5(x-1)+15=13
=>4x-5x+5=-2
=>5-x=-2
=>x=5+2=7
c: 2/3x-1/4=3/5-7/8
=>2/3x=3/5-7/8+1/4=24/40-35/40+10/40=-1/40
=>x=-1/40:2/3=-1/40*3/2=-3/80
d: 1/2(2x-3)+105/2=-137/2
=>1/2(2x-3)=-137/2-105/2=-242/2=-121
=>2x-3=-242
=>2x=-239
=>x=-239/2
tìm x biết
1) x=-1/2 + 3/4 2) x - 1/5 = 2/11 3) x - 5/6 = 16/42 + -8/56
4) x/5 = 5/6 + -19/30 5) |x| - 1/4 = 6/18 6)x = -1/2 +3/4
7) x/15 = 3/5 + -2/3 8)11/8 + 13/6 = 85/x 9) x - 7/8 = 13/12
10) x - -6/15 = 4/27 11) -\(\dfrac{-6}{12}\)+ x = 9/48 12) x - 4/6 = 5/25 + -7/15
1: x=3/4-1/2=3/4-2/4=1/4
2: x-1/5=2/11
=>x=2/11+1/5=21/55
3: x-5/6=16/42-8/56
=>x-5/6=8/21-4/28=5/21
=>x=5/21+5/6=15/14
4: x/5=5/6-19/30
=>x/5=25/30-19/30=6/30=1/5
=>x=1
5: =>|x|=1/3+1/4=7/12
=>x=7/12 hoặc x=-7/12
6: x=-1/2+3/4
=>x=3/4-1/2=1/4
11: x-(-6/12)=9/48
=>x+1/2=3/16
=>x=3/16-1/2=-5/16
1)x= 1/4
2)x= 2/11+ 1/5
x= 21/55
3)x - 5/6 = 5/21
x = 5/21+5/6
x = 15/14
4)x/5 = 5/6 + -19/30
x:5 = 1/5
x = 1/5.5
x = 1
5) |x| - 1/4 = 6/18
|x| = 6/18 - 1/4
|x| =7/12
⇒x= 7/12 hoặc -7/12
6)x = -1/2 +3/4
x= 1/4
7) x/15 = 3/5 + -2/3
x:15 = -1/15
x = -1/15. 15
x = -1
8)11/8 + 13/6 = 85/x
85/24 = 85/x
⇒ x = 24
9) x - 7/8 = 13/12
x = 13/12 + 7/8
x = 47/24
10)x - -6/15 = 4/27
x = 4/27 + (-6/15)
x = -34/135
11) -(-6/12)+x = 9/48
x= 9/48 - 6/12
x = -5/16
12) x - 4/6 = 5/25 + -7/15
x -4/6 = -4/15
x = -4/15 + 4/6
x = 2/5
mình sẽ vote 5 sao
1/ tìm x thuộc Z , biết : - 5 ≤ x + 1 < 5
2/ tìm x : x - ( 17 - x) = x - 7
3/ tìm x rồi tính tổng : ( - 3) + | -2| ≤ x < ( -5) + 7
4/ tìm số nguyên a :
a/ |a+3|=7
b/ |a-5|-1=4
5/ tính
a/ (-8) - (-2)
b/ (-3)+8-12
6/ tính nhanh
- (13+49)-(100-49-13)
7/ tính tổng
a/ S = 2 + (-4)+6+(-8)+...+2018+(-2020)
b/tìm x biết : (-1)+(-4)≤x <(-10)+5+7
Ko chép đề
\(2)x-17+x=x-7\)
\(x+x-x=-7+17\)
\(x=-10\)
Vậy ....
âm 10 , nhỉ ?
Tìm x biết:
a, x+1/10+x+1/11+x+1/12+x+1/13
b,x+10/20+x+8/22=x+6/24+x+3/27
c,x+7/19+x3/15=x+7/16+x+3/15
Bui Bao Ngoc oi! phan a,la (x+1)/10 hay x+(1/10)?
cac phan khac nua!
Tìm x Î Z biết:
a) x ( x - 3) = 0;
b) x ( x + 9) = 0;
c) ( x + 1) ( x - 1) = 0;
d) ( x - 13 ) ( x 2 + 8 ) = 0 .
a) x Î{0;3}.
b) xÎ{0;-9}.
c) x Î{-l; 11}.
d) x = 13.
Tìm x thuộc Z biết a) x ( x - 3) = 0; b) x ( x + 9) = 0 c) ( x + 1) ( x - 1) = 0 d) ( x - 13) ( x 2 + 8) = 0
Tìm x biết
a) 13 x ( x +1 ) =143
b) ( x - 2 ) : 7 = 12
c) 120 : ( x - 3 )= 8
a) 13 x ( x +1 ) =143
x+1= 143 : 13
x+1= 11
x= 11-1
x= 10
b) ( x - 2 ) : 7 = 12
x-2= 12 x 7
x-2=84
x=84+2
x=86
c) 120 : ( x - 3 )= 8
x-3=120:8
x-3=15
x=15+3
x=18