(x + 1) + (x + 4) + (x + 7) + ... + (x+49)=442. tìm x
bài 1 : Tìm x
a) 5 + ( x + 27 ) = 64
b) 64 - ( x - 2 ) = 25
c) 7 - ( x + 5 ) + 14 = 343
d) 5 . x - 25 = 10
e) 4 . ( x - 5 ) - 8 = 48
f) 49 - ( 15 + x ) = 12
g) 49 - 7. ( 13 - x ) = 14
h) 155 - 10. ( x + 1 ) = 55
5 + ( x + 27 ) = 64
( x + 27 ) = 64 - 5 ( x + 27 ) = 59 x = 59 - 27 x = 32a) \(\Rightarrow x+27=59\Rightarrow x=32\)
b) \(\Rightarrow x-2=39\Rightarrow x=41\)
c) \(\Rightarrow x+5=-322\Rightarrow x=-327\)
d) \(\Rightarrow5x=35\Rightarrow x=7\)
e) \(\Rightarrow4\left(x-5\right)=56\Rightarrow x-5=14\Rightarrow x=19\)
f) \(\Rightarrow15+x=37\Rightarrow x=22\)
g) \(\Rightarrow7\left(13-x\right)=35\Rightarrow13-x=5\Rightarrow x=8\)
h) \(\Rightarrow10\left(x+1\right)=100\Rightarrow x+1=10\Rightarrow x=9\)
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
a)(x+7)(3x-1)=x^2-49
b)5(x-3)-4=2(x-1)+7
\(a,\left(x+7\right)\left(3x-1\right)=x^2-49\)
\(\left(x+7\right)\left(3x-1\right)-\left(x+7\right)\left(x-7\right)=0\)
\(\left(x+7\right)\left(3x-1-x+7\right)=0\)
\(\left(x+7\right)\left(2x+6\right)=0\)
\(\hept{\begin{cases}x+7=0\\2x+6=0\end{cases}}\)
\(\hept{\begin{cases}x=-7\\x=-3\end{cases}}\)
\(b,5\left(x-3\right)-4=2\left(x-1\right)+7\)
\(5x-15-4=2x-2+7\)
\(5x-19=2x+5\)
\(3x=24\)
\(x=8\)
Bài 1: Tìm x :
a. ( x + 4 )2 - ( x + 1 ) ( x - 1 ) = 16
b. ( 2x - 1 )2 + ( x + 3 )2 - 5 ( x + 7 ) ( x - 7 ) = 0
c. ( x - 2 )3 - ( x - 3 ) ( x2 + 3x + 9 ) + 6 ( x + 1 )2 = 49
Bài 1: Tìm x :
a. ( x + 4 )2 - ( x + 1 ) ( x - 1 ) = 16
b. ( 2x - 1 )2 + ( x + 3 )2 - 5 ( x + 7 ) ( x - 7 ) = 0
c. ( x - 2 )3 - ( x - 3 ) ( x2 + 3x + 9 ) + 6 ( x + 1 )2 = 49
B1 tìm số nguyên x,y biết
a) (x-1) . ( y+1) =5
b) (x+y) . (y-3)= -3
c) x . y = -35
B2 tìm x thuộc Z biết
a) 12 . x = 144
b) 0 . x = 4
c) 5 . x =0
d) 3 . (x-4)=0
e) (x+1) . (x-3)=0
f) (x2+7) . ( x2-49)=0
g) (x2+7) . (x2-49)<0
h) (x2+7) . ( x2-49) >0
Dạng 2 : Tìm x Bài 1: Tìm x biết :
a) ( x – 16 ) – 74 = 0 b) (3 x – 5) .7 mũ 3 = 7 mũ 4
c) 560 – 13x = 365 d) 275 – 7( x + 1) = 100
e) 3 x 7 14 3.2 mũ 3 f) 7x – 49 = 105
g) 5x – 16 = 14 h) 3x – 138 = 23 . 2 2
Tìm x,biết:
A) 8 + ( x - 9)= 125 - 64
B) 5×(x+7) -10 = 8×5
C) 7 × 7 - 7( 13 - 2× x) = 14
D) 320 : (x - 1) = ( 125 - 5 ×5 ) : 4 + 15
E) 240 : ( x -5 ) = 4 × 5 ×5 - 60 : 3
F) 49 × x - 14 × x = 49 × 10 - 70
a. 8 + (x - 9) = 125 - 64
8 + (x - 9) = 61
x - 9 = 53
x = 62
b. 5 x (X + 7) - 10 = 8 x 5
5 x (X + 7) - 10 = 40
5 x (X + 7) = 50
X + 7 = 10
X = 3
bài 7 tìm x
3,(x+1)=(x+1) 4,x(2x-3)-2(3-2x)=0
6,
3: =>x(x+1)=0
=>x=0 hoặc x=-1
4: =>(2x-3)(x+2)=0
=>x=3/2 hoặc x=-2
6: =>6x=7 hoặc 6x=-7
=>x=7/6 hoặc x==7/6