7 x 5 x 100 - 8 x 201 = ?
1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 x 9 x 10 : 100 x 201 : 237 x 479 x 100 : 2000 x 22,36
Đây là câu đố vui rất hay
40793.96757982241
bài này dễ
bằng 40793.96757982241
bài 1 : tìm x biết
a, 100-7.(x-5)=65
b, 12.(x-3):3=64+8
c, 26+5x =125:5
d, 5x-201=2.2.2.2.2
12.(x-3):3=64+8
12.(x-3):3=72
12.(x-3) =72.3
12.(x-3) =216
x-3 =216:12
x-3 =18
x =18+3
x =21
100-7.(x-5)=65
7.(x-5)=100-65
7.(x-5)=35
x-5=35:7
x-5=5
x =5+5
x =10
Vậy x = 10
5x -201=2 x 2 x 2 x 2 x 2
5x - 201=32
5x =32+201
5x = 233
tự làm tiếp nhé
x X 2 + X x 5 + X x 8 = X x 9 + X x 7+ X x 1/3 + 201
x . 2 + x . 5 + x . 8 = x . 9 + x . 7 + x . 1/3 + 201
x . ( 2 + 5 + 8 ) = x . ( 9 + 7 + 1/3 ) +201
x . 15 = x . 49/3 + 201
15x = 49/3x + 201
15x - 201 = 49/3x
giảm mỗi vế đi 15x , ta có :
-201 = 4/3x
x = (-201) : 4/3
x = -150,75
Vậy x = -150,75
\(x\times2+x\times5+x\times8=x\times9+x\times7+x\times13+201\)
\(x\times\left(2+5+8\right)=x\times\left(9+7+13\right)+201\)
\(x\times15-x\times29=201\)
\(x\times\left(-14\right)=201\)
\(x=201:\left(-14\right)=\)Số dài quá bạn ơi!
tìm x biết
a 100-7x(x-5)=65
b 12x(x-3):3=64+8
c 26+5x=125:5
d 5x-201=2x2x2x2x2
Bài này dễ mà, you có thể tự làm được
Giải pt sau:
1,x+2/2002 +x+5/1999 +x+201/1803=-3
2,x+1/99 +x+3/97 +x+5/95=x+9/91 +x+8/92 +x+7/93.
\(\frac{x+2}{2002}+\frac{x+5}{1999}+\frac{x+201}{1803}=-3\)
\(\Rightarrow\frac{x+2}{2002}+1+\frac{x+5}{1999}+1+\frac{x+201}{1803}+1=0\)
\(\Rightarrow\frac{x+2004}{2002}+\frac{x+2004}{1999}+\frac{x+2004}{1803}=0\)
\(\Rightarrow\left(x+2004\right)\left(\frac{1}{2002}+\frac{1}{1999}+\frac{1}{1803}\right)=0\)
Dễ thấy \(\left(\frac{1}{2002}+\frac{1}{1999}+\frac{1}{1803}\right)>0\)nên x + 2004 = 0
Vậy x = -2004
Câu 1:Tính
a.7/13 x 7/15 - 5/12 x 21/39 + 49/91 x 8/15
b. (12/199 + 23/200 - 34/201) x (1/2 - 1/3 - 1/6)
Câu 2 :Tìm x bt:
1. 0,5 + ( X - 15/2 ) : 1/2 = 9/2
2. 2012 x X - 2010 x X = 2014
3. ( X+ 1) + ( X + 2) + ( X + 3 ) + .....+ ( X + 100 ) =5750
Ai nhanh mk tik.Thanks nhìu
a) \(\frac{7}{13}x\frac{7}{15}-\frac{5}{12}x\frac{21}{39}+\frac{49}{91}x\frac{8}{15}=\frac{7}{13}x\frac{7}{15}-\frac{5}{12}x\frac{7}{13}+\frac{7}{13}x\frac{8}{15}\)
\(=\frac{7}{13}x\left(\frac{7}{15}-\frac{5}{12}+\frac{8}{15}\right)=\frac{7}{13}x\left(1-\frac{5}{12}\right)=\frac{7}{13}x\frac{7}{12}=\frac{49}{156}\)
b) \(\left(\frac{12}{199}+\frac{23}{200}-\frac{34}{201}\right)x\left(\frac{1}{2}-\frac{1}{3}-\frac{1}{6}\right)=\left(\frac{12}{199}+\frac{23}{200}-\frac{34}{201}\right)x0=0\)
Bài 2:
a) \(0,5+\left(x-\frac{15}{2}\right):\frac{1}{2}=\frac{9}{2}\)
\(\left(x-\frac{15}{2}\right):\frac{1}{2}=4\)
\(x-\frac{15}{2}=2\)
x = 19/2
b) \(2012\times x-2010\times x=2014\)
\(x\times\left(2012-2010\right)=2014\)
\(x\times2=2014\)
x = 1007
c) ( x + 1) + (x+2) + (x+3)+...+(x+100) = 5750
\(x\times100+\left(1+2+3+...+100\right)=5750\)
\(x\times100+5050=5750\)
\(x\times100=700\)
x = 7
a) (6x - 39 ) : 3 = 201
b) 5 ( x + 35 ) = 515
c) 219 - 7(x + 1) = 100
a, (6x-39) :3= 201
6x-39= 201.3
6x-39= 603
6x= 603+39
6x= 642
x= 642:6
x= 107
\(\left(6x-39\right):3=201\)
\(\Rightarrow6x-39=201.3=603\)
\(\Rightarrow6x=603+39=642\)
\(\Leftrightarrow x=642:6=107\)
Vậy x=107
Giải pt sau:
1,x+2/2002 +x+5/1999 +x+201/1803=-3
2,x+1/99 +x+3/97 +x+5/95=x+9/91 +x+8/92 +x+7/93.
\(\frac{x+2}{2002}+\frac{x+5}{1999}+\frac{x+201}{1803}=-3\)
\(\Leftrightarrow\frac{x+2}{2002}+1+\frac{x+5}{1999}+1+\frac{x+201}{1803}+1=-3+1+1+1\)
\(\Leftrightarrow\frac{x+2004}{2002}+\frac{x+2004}{1999}+\frac{x+2004}{1803}=0\)
\(\Leftrightarrow\left(x+2004\right)\left(\frac{1}{2002}+\frac{1}{1999}+\frac{1}{1803}\right)=0\)
\(\Leftrightarrow x+2004=0\left(\frac{1}{2002}+\frac{1}{1999}+\frac{1}{1803}\ne0\right)\)
<=> x=-2004
a,\(\frac{x+2}{2002}+\frac{x+5}{1999}+\frac{x+201}{1803}=-3\)
\(< =>\left(\frac{x+2}{2002}+1\right)+\left(\frac{x+5}{1999}+1\right)+\left(\frac{x+201}{1803}+1\right)=0\)
\(< =>\frac{x+2004}{2002}+\frac{x+2004}{1999}+\frac{x+2004}{1803}=0\)
\(< =>\left(x+2004\right).\left(\frac{1}{2002}+\frac{1}{1999}+\frac{1}{1803}\right)=0\)
Do \(\frac{1}{2002}+\frac{1}{1999}+\frac{1}{1803}\ne0\)
\(=>x+2004=0\)
\(=>x=-2004\)
\(\frac{x+2}{2002}+\frac{x+5}{1999}+\frac{x+201}{1803}=-3\)
\(\Leftrightarrow\left(\frac{x+2}{2002}+1\right)+\left(\frac{x+5}{1999}+1\right)+\left(\frac{x+201}{1803}+1\right)=0\)
\(\Leftrightarrow\frac{x+2004}{2002}+\frac{x+2004}{1999}+\frac{x+2004}{1803}=0\)
\(\Leftrightarrow\left(x+2004\right)\left(\frac{1}{2002}+\frac{1}{1999}+\frac{1}{1803}\right)=0\)
\(\Leftrightarrow x=-2004\)
\(\frac{x+1}{99}+\frac{x+3}{97}+\frac{x+5}{95}=\frac{x+9}{91}+\frac{x+8}{92}+\frac{x+7}{93}\)
\(\Leftrightarrow\left(\frac{x+1}{99}+1\right)+\left(\frac{x+3}{97}+1\right)+\left(\frac{x+5}{95}+1\right)=\left(\frac{x+9}{91}+1\right)+\left(\frac{x+8}{92}+1\right)+\left(\frac{x+7}{93}+1\right)\)
\(\Leftrightarrow\frac{x+100}{99}+\frac{x+100}{97}+\frac{x+100}{95}=\frac{x+100}{91}+\frac{x+100}{92}+\frac{x+100}{93}\)
\(\Leftrightarrow\left(x+100\right)\left(\frac{1}{99}+\frac{1}{98}+\frac{1}{95}-\frac{1}{91}-\frac{1}{92}-\frac{1}{93}\right)=0\)
Để ý thấy cụm đằng sau < 0 nên x=-100