25 x (1000 x 1000)
a 989898/454545 - 31313131/15151515
b 10101x < 5/10101 + 5/20202 + 5/30303 + 5/40404
c 1/1000 + 13/1000 + 25/1000 + 37/1000 + 49/1000 + ..........+ 87/1000 + 99/1000.
d 2006/2008 x 2001/2004 x 2008/2002 x 2004/2006 x 1001/2001
a=\(\frac{1}{9}\)
c=\(\frac{3069}{500}\)
1. Tìm x để A = 2007 - 48/X+2 có giá trị bé nhất
2. Tính nhanh: B=1/1000+13/1000+25/1000+37/1000+....+85/1000+97/1000
1,
a, 20,2 x 5,1 - 30,3 x 3,4 + 14,58
14,58 x 460 + 7,29 + 540 x 2
b, 1/1000 + 13/1000 + 25/1000 + ...+ 97/1000 + 109/1000
2,
a, 6/8 = 15/x
b, (x+1) + (x + 4) + (x + 7) + ... + (x + 28) - 155
c, 71 + 65 x 4 = y + 140/y +260
a.1 là phân số nhé. Các bạn giúp mình với mình đang cần gấp
x*78+x*25=1000
\(x\) \(\times\) 78 + \(x\) \(\times\) 25 = 1 000
\(x\) \(\times\) ( 78 + 25) = 1000
\(x\) \(\times\) 103 = 1000
\(x\) = 1000 : 103
\(x\) = \(\dfrac{1000}{103}\)
78x + 25x = 1000
<=> 103x = 1000
<=> x=\(\dfrac{1000}{103}\)
x + 25 x 4 = 1000
x+25.4=1000
x+100 =1000
x = 1000-100
x = 900.
x + 25 x 4 = 1000
x + 100 = 1000
x = 1000 - 100
x = 900
57,3 - 25/10 x 9,32 + 4264/1000 - 2,5 x 68%
Câu 8
a,1000:(x x 25)=8 b,(x:30)x8=8x1350
\(1000:\left(x\times25\right)=8\\ x\times25=1000:8\\ x\times25=25\\ x=25:25=1\)
_______________
\(\left(x:30\right)\times8=8\times1350\\ \left(x:30\right)\times8=10800\\ x:30=10800:8\\ x:30=1350\\ x=1350\times30\\ x=40500\)
x x 25 = 1000 :8
x x 25 = 125
x = 125 : 25
x = 6
(x:30)x8= 10800
x : 30 = 10800 : 8
x : 30 = 1350
x = 1350 x 30
x = 40500
\(a,1000:\left(x\times25\right)=8\)
\(\Leftrightarrow x\times25=1000:8\)
\(\Leftrightarrow x\times25=125\)
\(\Leftrightarrow x=125:5\)
\(b,\left(x:30\right)\times8=8\times1350\)
\(\Leftrightarrow x:30=10800:8\)
\(\Leftrightarrow x:30=1350\)
\(\Leftrightarrow x=1350\times30\)
\(\Leftrightarrow x=40500\)
\(\Leftrightarrow x=25\)
Tính nhanh :
2242,82 :100 + 37411,8 : 1000 / 25 x 14.96 x 16
Tính nhẩm:
25 : 0,25 = ………
4,864 x 1000 =………