(x+2)+(x+4)+(x+6)+...+(x+100)=6000
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(X+2)+(X+4)+(X+6)+...+(X+100)=6000
=>(X+X+X+...+X)+(2+4+6+...+100)=6000
=>(X+X+X+...+X)+{(2+102)x[(100-2):2+1]:2}=6000
=>(X+X+X+...+X)+{102x[98:2+1]:2}=6000
=>(X+X+X+...+X)+{102x50:2}=6000
=>50X+5100:2=6000
=>50X+2550=6000
=>50X=6000-2550
=>50X=3450
=>X=3450:50
=>X=69
1+2+3+4+...+X=15
=>X=15:(1+2)
=>X=15:3
=>X=5
(x + 2) + (x + 4) + ... + (x + 100) = 6000
(x + x + ... + x) + (2 + 4 + ... + 100) = 6000
50 số x 50 số hạng
=> 50.x + 2.(1 + 2 + ... + 50) = 6000
=> 50.x + 2.(1 + 50).50:2 = 6000
=> 50.x + 51.50 = 6000
=> 50.(x + 51) = 6000
=> x + 51 = 6000 : 50
=> x + 51 = 120
=> x = 120 - 51
=> x = 69
50x+\(\left(\frac{100-2}{2}+1\right)\left(\frac{100+2}{2}\right)\) =6000
50x+2550=6000
50x=3450
x=69
a) pt a <=> 3x+1=0 hoặc x-2000=0 hoặc 3x+6000=0
<=> x=-1/3 hoặc x=2000 hoặc x=-2000
5000 + 100 = 5100
7400 - 400 = 7000
2000 3 + 600 = 6600
8000 : 2 + 2000 = 6000
6000 - (5000 - 1000) = 2000
6000 - 5000 + 1000 = 2000
7000 - 3000 x 2 = 1000
(7000 - 3000) x 2 = 8000
5000 + 100 = 5100
7400 - 400 = 7000
2000 3 + 600 = 6600
8000 : 2 + 2000 = 6000
6000 - (5000 - 1000) = 2000
6000 - 5000 + 1000 = 2000
7000 - 3000 x 2 = 1000
(7000 - 3000) x 2 = 8000
Bài 3 :
b) Ta có 1+ 2 + 3 +4 + ...+ x =15
Nên \(\frac{x\left(x+1\right)}{2}=15\)
\(x\left(x+1\right)=30\)
=> \(x\left(x+1\right)=5.6\)
=> x = 5
Bài 2:
h; \(\dfrac{2}{3}\)\(x\) + 50% + \(x\) = \(\dfrac{1}{10}\)
\(\dfrac{2}{3}\)\(x\) + \(\dfrac{1}{2}\) + \(x\) = \(\dfrac{1}{10}\)
(\(\dfrac{2}{3}\)\(x\) + \(x\)) + \(\dfrac{1}{2}\) = \(\dfrac{1}{10}\)
\(x\) \(\times\) (\(\dfrac{2}{3}\) + 1) + \(\dfrac{1}{2}\) = \(\dfrac{1}{10}\)
\(x\) \(\times\) \(\dfrac{5}{3}\) + \(\dfrac{1}{2}\) = \(\dfrac{1}{10}\)
\(x\) \(\times\) \(\dfrac{5}{3}\) = \(\dfrac{1}{10}\) - \(\dfrac{1}{2}\)
\(x\) \(\times\) \(\dfrac{5}{3}\) = \(\dfrac{-2}{5}\)
\(x\) = \(\dfrac{-2}{5}\): \(\dfrac{5}{3}\)
\(x\) = - \(\dfrac{6}{25}\)
Lớp 5 chưa học số âm em nhé.
a, 58647 - x : 6 + 1383 = 6000
58647 - x : 6 = 6000 - 1383
58647 - x : 6 = 4617
x : 6 = 58647 - 4617
x : 6 = 54030
x = 54030 x 6
x = 324180
b, 48576 + x . 4 - 47684 = 1692
48576 + x . 4 = 1692 + 47684
48576 + x . 4 = 49376
x . 4 = 49376 - 48576
x . 4 = 800
x = 800 : 4
x = 200
a)58647-x:6+1383=6000
58647-x:6 =6000-1383
58647-x:6 =4617
x:6 =58647-4617
x:6 =54030
x =54030x6
x =324180.
b) 48576+x.4-47684=1692
48576+x.4 =1692+47684
48576+x.4 =49376
x.4 =49376-48576
x.4 =800
x =800:4
x =200
(x+2)+(x+4)+(x+6)+...+(x+100)=6000
(x+x+...+x)+(2+4+6+...+100)=6000
50x+2550=6000
50x=6000-2550
50x=3450
x=3450:50
x=69