tim x biet:
/x/+13=17
tim x biet |5-x|-17=13
\(\left|5-x\right|-17=13\)
th1: \(5-x\ge0\Leftrightarrow x\le5\)
\(\Rightarrow\left|5-x\right|-17=13\Leftrightarrow5-x-17=13\Leftrightarrow x=5-17-13\)
\(\Leftrightarrow x=-25\left(tmđk\right)\)
th2: \(5-x< 0\Leftrightarrow x>5\)
\(\Rightarrow\left|5-x\right|-17=13\Leftrightarrow-\left(5-x\right)-17=13\Leftrightarrow-5+x-17=13\)
\(\Leftrightarrow x=13+17+5\Leftrightarrow x=35\left(tmđk\right)\)
vậy \(x=-25;x=35\)
|5-x|-17=13
|5-x|=13+17
|5-x|=30
Nếu 5-x=-30 thì :
x=5-(-30)
x=35
Nếu 5-x=30 thì :
x=5-30
x=-25
a,Tim x biet:1+5+9+13+17+...+x=507528
bai 1)tim x biet
a )24-(36+5)=x
b)14-21=(13-x)-(15+8)
bai 2) tim x biet
a)17-x=-25+(-16+9)
b)3x-21=-19-(-2x)
Bài 1: Tìm x, biết
a )24-(36+5)=x b)14-21=(13-x)-(15+8)
24-41=x (13-x)-23=-7
x=-17 13-x=(-7)+23
Vậy x=-17 13-x=16
x=13-16
x=-3 Vậy x=-3
Bài 2:Tìm x, biết
a)17-x=-25+(-16+9) b)3x-21=-19-(-2x)
17-x=-25+(-7) 3x-21=-19+2x
17-x=-32 3x-2x=-19+21
x=17-(-32) x=4
x=49 Vậy x=4
Vậy x=49
Bài 1:
a. 24 - (36+5) = x
=> 24 - 41 = x
=> -17 = x
=> x = -17
b. 14 - 21 = (13 - x) - (15 + 8)
=> -7 = 13 - x - 23
=> -7 - 13 + 23 = -x
=> 3 = -x
=> x = -3
Bài 2:
a. 17 - x = -25 + (-16 + 9)
=> 17 - x = -25 + (-7)
=> 17 - x = -32
=> 17 + 32 = x
=> x = 49
b. 3x - 21 = -19 - (-2x)
=> 3x - 21 = -19 + 2x
=> 3x - 2x = -19 + 21
=> x = 2
Bài1
a)24-(36+5)=x\(\Rightarrow\)x=24-41=-17
b)14-21=(13-x)-(15+8)\(\Rightarrow\)(13-x)-(15+8)=-7\(\Rightarrow\)13-x=-7+23=16\(\Rightarrow\)x=13-16=-3
Bài2
a)17-x=-25+(-16+9)\(\Rightarrow\)17-x=-25+-7\(\Rightarrow\)17-x=-32\(\Rightarrow\)x=17-(-32)=17+32=49
b)3x-21=-19-(-2x)\(\Rightarrow\)3x-(-2x)=-19-21\(\Rightarrow\)3x+2x=-40\(\Rightarrow\)5x=-40\(\Rightarrow\)x=-8
giup minh nha mai minh nop roi ^_^ ^_^
Ta có : 1 = 0 + 1 ; 5 = 2 + 3; 9 = 4 + 5;
13 = 6 +7 ; 17 = 8+ 9; ....
Do đó => x = a + (a+1) (a ∈∈N*)
=> 1 + 5 + 9+ 13 + 17 +....+ x = 4950
= 1 + 2+3+4+5+6+...+ a + (a+1) = 4950
Hay [(a+1)+1]×(a+1)2[(a+1)+1]×(a+1)2 = 4950
=> (a+1)(a+2) = 4950 .2 = 9900
=> (a+1)(a+2) = 99.100
=> a = 98
Do đó : x = a+ (a+1) = 98 + (98 + 1) = 197
tim so tu nhien x biet
x:13=41
1428:x=14
4*x:17=0
7*x-8=713
8*(x-3)=0
0:x=0
1.x=533
2.x=102
3.x=0
4.x=103
5.x=3
6.x thuộc Z , x khác 0
x:13=41
x=41.13
x=533
vậy x=533
1428:x=14
x=1428:14
x=102,71429
vậy x=102,71429
4x:17=0
4x=0.17
4x=0
x=0:4
x=0
vậy x=0
7x-8=713
7x=713+8
7x=721
x=721:7
x=13
vậy x=13
8.(x-3)=0
x-3=0:8
x-3=0
x=0+3
x=3
vậy x=3
0:x=0
x=0:0
x=0
vậy x=0
tim x thuoc n biet : b,(149 nhan 35 : x + 5) nhan 17 =13 va d/(3 nhan x tru 3 ) binh phuong 3 =2 nhan 32 e/5 x+1-5x=500
tim so tu nhien x biet:
a> x:13=41
b>1428:x=14
c>4x:17=0
d>7x-8=718
e>8(x-3)=0
Mik ko ghi đề
Câu a)x=41×13 x=533
Câu b)x=1428:14 x=102
Câu c)4x=0×17
4x=0
x=0+4
x=4Mik mỏi tay ko viết nữa sorry
tim x biet : 13 x 13 x 13 x 13 x X = 428415
28561 x X = 428415
X = 428415 : 28561
X = 15
Nhớ tck
# HỌC TỐT
28561 x X = 428415
X =428415:28561
X =15
Tim x biet:
-(-39-3x)-(-13+2x-17)=-47+29
Jup minh nha
-(-39 - 3x) - (-13 + 2x - 17 ) = -47 + 29
=> 39 + 3x + 13 - 2x + 17 = -18
=> 3x - 2x = -39 - 13 - 17 - 18
=> x = -87
Ta có: -(-39-3x)-(-13+2x-17)=-47+29
=> 39+3x+13-2x+17=-18
=> 39+13+17+(3x-2x)= -18
=> 69 + x = -18
=> x= 69-(-18)
=> x= 87
vậy x=87