50 x 2
tìm x : típ
2 005 . ( x - 2 006 ) = 2005
[ ( x + 50 ) . 50 - 50 ] : 50 = 50
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
(50 x 76 - 50 x 24 + 50 x 22) x 2 =
= [ 50 x ( 76 - 24 + 22)] x 2
= 50 x 74 x 2
= (50 x 2) x 74
= 100 x 74
= 7400.
7400 vi minh khong the lam loi giai duoc nen xin loi nha( > _ < )
tìm x:
x + 50 - 40 = 50 + 50 x 2
x + 50 - 40 = 50 + 100
x + 50 - 40 = 150
x + 50 = 150 + 40 = 190
x = 190 - 50 = 140
x + 50 - 40 = 50 + 50 x 2
x + 50 - 40 = 150
x + 50 = 150 + 40
x + 50 = 190
x = 190 - 50
x = 140
ai k mik mik thề sẽ k lại hứa đó
x + 50 - 40 = 50 + 50 x 2
x + 50 - 40 = 50 x ( 1 + 2 )
x + 50 - 40 = 50 x 3
x + 50 - 40 = 150
x + 50 = 150 + 40
x + 50 = 190
x = 190 - 50
x = 140
mình nha
tìm x
a) 50%+2/3X=X+4
b) (2/4/5X+50)1/1/2=-50
1,Giải phương trình:
\(\frac{x+1}{99}\)+\(\frac{x+2}{98}\)+...+\(\frac{x+50}{50}\)+50=0
Ta có: \(\dfrac{x+1}{99}+\dfrac{x+2}{98}+...+\dfrac{x+50}{50}+50=0\)
\(\Leftrightarrow\dfrac{x+1}{99}+1+\dfrac{x+2}{98}+1+...+\dfrac{x+50}{50}+1=0\)
\(\Leftrightarrow\dfrac{x+100}{99}+\dfrac{x+100}{98}+...+\dfrac{x+100}{50}=0\)
\(\Leftrightarrow\left(x+100\right)\left(\dfrac{1}{99}+\dfrac{1}{98}+...+\dfrac{1}{50}\right)=0\)
mà \(\dfrac{1}{99}+\dfrac{1}{98}+...+\dfrac{1}{50}>0\)
nên x+100=0
hay x=-100
Vậy: S={-100}
\(\dfrac{x+1}{99}+\dfrac{x+2}{98}+...+\dfrac{x+50}{50}+50=0\)
\(\Leftrightarrow\left(\dfrac{x+1}{99}+1\right)+\left(\dfrac{x+2}{98}+1\right)+\left(\dfrac{x+3}{97}+1\right)+...+\left(\dfrac{x+50}{50}+1\right)=0\)
\(\Leftrightarrow\dfrac{x+100}{99}+\dfrac{x+100}{98}+...+\dfrac{x+100}{50}=0\)
\(\Leftrightarrow\left(x+100\right).\left(\dfrac{1}{99}+\dfrac{1}{98}+\dfrac{1}{97}+...+\dfrac{1}{50}\right)=0\)
\(\Leftrightarrow x+100=0\) (vì \(\dfrac{1}{99}+\dfrac{1}{98}+\dfrac{1}{97}+...+\dfrac{1}{50}>0\) )
\(\Leftrightarrow x=-100\)
2 x (X-8)=50
2 x X -8=50
2 x (X-8) = 50
X-8 = 50 : 2
X-8 = 25
X = 25 + 8
X = 33
vậy X = 33
2 x X -8 = 50
X-8 = 50 : 2
X-8 = 25
X = 25 + 8
X = 33
vậy X = 33
học tốt!!#
(50- 3 x X ) : 4 x2 -30 : 2 +2 x 7 =21
A = 33...3/50 chữ số 3 x 99...9/50 chữ số 9
( X + 2 ) + ( X+ 4) + ... + (X + 1996) = 99800
(x+2)+(x+4)+...+(x+1996) = 99800
=> (x+x+x+...+x)+(2+4+...+1996) = 99800
=> 998x + 997002 = 99800
998x = 99800 - 997002
998x = -897202
x = -897202 : 998
x = -899
\(x+\sqrt{50-x^2}+x\sqrt{50-x^2}=15\)
1. 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]
2. Cho x thuộc Q. So sánh [x] và x; [x] và y với y thuộc Z, y < x
Help me!