X + 2 x X +3 x X + ...... + 50 x X = 2 + 4 + 6 + ..... + 100. tìm X
A) 45 - 20 : ( X + 2 ) = 5
B) 25% x X + 50% x X - 3/4 x X + 4 x X = 10
C) X x 2 + X x 4 + X x 6 +...+ X x 100 = 5100
X viết hoa, tìm x dùm mình nhé. Cảm ơn
tính nhanh
341.67+ 314. 16+ 659. 83
42. 53+ 47. 156 - 47. 114
tìm x biết
1+2+3+...+x=45
2+4+6+...+x=64.65
3+7+11+...+x=40.81
x+(x+1)+(x+2)+...+(x+100)=60.101
x+(x+3)+(x+6)+...+(x+147)=25.157
(x+2)+(x+4)+(x+6)+...+(x+50)=25.29
Tính:
a.[100/3]+[100/3^2]+[100/3^3]+[100/3^4]
b.[50/2]+[50/2^2]+[50/2^3]+[50/2^4]+[50/2^5]
c.[x]+[x+2/3]+[x+4/3]+[x+7/3]+[x+10/3] với x=-2,7
Tìm x:
A,219-7(x+1)=100
B,(3x-6).3=3^4
C,3^x.3^2=243
d,20-[7(x-3)+4]=2
E,[(6x-39):3].28=5628
F,x^50=x
G,(3.x-2^4).7^3=2.7^4
H,(x-9)^2-4=21
a) 219-7x-7=100
212-7x=100
7x=112
x=16
các câu còn lại cứ thế mà làm
756 = 700 + 50 + ….. = 7 x 100 +……. x 10 + 6 b) 862 = …….. x 100 + …….. x 10 + 2 4 x 2 + 4 x 5 + 4 =…………………….. a x 7 + a x 2 + a =……………………. c) abc = ….. … x 100 +……… x 10 + …….
756 = 700 + 50 + 6 hoặc 7 x 100 + 5 x 10 + 6 x 1
862 = 8 x 100 + 6 x 10 + 2
HT
a) 756 = 700 + 50 + 6 = 7 x 100 + 5 x 10 + 6
b) 862 = 8 x 100 + 6 x 10 + 2
c) 4 x 2 + 4 x 5 + 4 = 4 x (2 + 5 + 1) = 4 x 8 = 32
d) a x 7 + a x 2 + a = a x (7 + 2 + 1) = a x 10 = a0
e) abc = a x 100 + b x 10 + c
Chúc bạn học tốt.
😁😁😁
Bài 6 Tìm x
1) ( x+1 ) + ( x+2 ) + ( x+3 ) + ... + ( x+100 ) = 5750
2) ( 2x-1 ) + ( 4x-2 ) + ... + ( 200x - 100 ) = 5050
3) ( x+2 ) + ( x+4 ) + ( x+6 ) + ... + ( x + 100) = 2650
CÂU 1: A = x2+x4+x6+...+x100 : VỚI x = -1
CÂU 2: Tìm x
|x-1/3|+4/5=|(-3,2)+2/50|
Mọi người giải hộ mình, NHANH LÊN NHA!!!
Câu 1 : A = 1+1+1+...+1 ( 50 số 1 ) = 50
1.
A = x2 + x4 + x6 + ... + x100 ( 50 số hạng )
A = ( -1 )2 + ( -1 )4 + ( -1 )6 + ... + ( -1 )100
A = 1 + 1 + 1 + ... + 1
A = 50
2.
| x - 1/3 | + 4/5 = | (-3,2) + 2/50 |
| x - 1/3 | + 4/5 = 3,16
| x - 1/3 | = 2,36
\(\Rightarrow\orbr{\begin{cases}x-\frac{1}{3}=2,36\\x-\frac{1}{3}=-2,36\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=\frac{202}{75}\\x=\frac{-152}{75}\end{cases}}\)
Quên mất, mọi người giải có công thức tính hộ mình nha!
a.( x - 1/2 ) * 5/3 = 7/4 - 1/2
b.( x + 4/3 ) * 7/4 = 5 - 7/6
c.x : 2 + x + x : 3 + x : 4 = 25
d.100% : x - 50% : x + 40% : x = 18% + 30%: x
B)
( x + 4/3 ) * 7/4 = 5 - 7/6
( x + 4/3) * 7/4 = 5/1 - 7/6
( x + 4/3) * 7/4 = 30/6 - 7/6
( x + 4/3) * 7/4 = 23/6
( x + 4/3) = 23/6 : 7/4
( x+ 4/3) = 23/6 . 4/7
( x+ 4/3) = 46/21
x = 46/21 - 4/3
x = 46/21 - 28/21
x = 18/21 = 6/7
Tk vs kb hộ mk nha! thank u
may cau khac ko kho lam dau chi co cau d thoi.
(100%-50%+40%):x=18%+30%:x
90%:x=18%+30%:x
18%=90%:x-30%:x
18%=60%:x
X=60%:18%
x=..................................................................................................
xong roi do a cho minh nhe
a)
( x - 1/2) * 5/3 = 7/4 - 1/2
( x - 1/2) * 5/3 = 7/4 - 2/4
( x - 1/2) * 5/3 = 5/4
( x - 1/2) = 5/4 : 5/3
( x - 1/2 ) = 5/4 . 3/5
( x - 1/2 ) = 3/4
x = 3/4 + 1/2
x = 3/4 + 2/4
x = 5/4
Tk + kb hộ mk nha! thanks
Tìm X
A. (X +1)+(X+2)+(X+3)+…+(X+ 100)=5750
B. X+(1+2+3+4+…+50)=2000
C. (X-1)+(X-2)+…+(X-100)=50
\(c,\)\(\left(x-1\right)+\left(x-2\right)+....+\left(x-100\right)=50\)
\(\left(x+x+...+x\right)-\left(1+2+...+100\right)=50\)
\(100x-5050=50\)
\(100x=50+5050\)
\(100x=5100\)
\(\Rightarrow x=\frac{5100}{100}=51\)
\(a,\left(x+1\right)+\left(x+2\right)+\left(x+3\right)+....+\left(x+100\right)=5750\)
\(\left(x+x+x+...+x\right)+\left(1+2+3+...+100\right)=5750\)
\(100x+5050=5750\)
\(100x=5750-5050\)
\(100x=700\)
\(\Rightarrow x=7\)
\(b,x+\left(1+2+3+...+50\right)=2000\)
\(x+\frac{\left[1+50\right]\cdot\left[\left(50-1\right)\div1+1\right]}{2}=2000\)
\(x+1275=2000\)
\(\Rightarrow x=2000-1275=725\)
c , ( x - 1 ) + ( x - 2 ) + ...... + ( x - 100 ) = 50
( x + x + ........ + ) - ( 1 + 2 + ..... + 100 ) = 50
100x - 5050 = 50
100x = 50 + 5050
100x = 5100
=> x = 5100/100 = 51