tìm x
a, (x+20):99 =(1004+1)x\(\frac{2}{99}\)
b, \(\frac{x+140}{x}\)+260= 21+65x4
\(\frac{x+140}{x}\)+260+=21+65x4
\(\frac{x+140}{x}+260=21+65×4\)
\(\frac{x+140}{x}+260=21+260\)
\(\frac{x+140}{x}=21\)
\(\left(x+140\right):x=21\)
x + 140=21× x
140= 21× X - X
140= 21×X-X×1
140=(21-1)×X
140=20×X
X=140:20
X=7
\(\left(x+140\right):x+260=21+260\)
\(\left(x+140\right):x=281-260\)
\(\left(x+140\right):x=21\)
\(x+140=21\times x\)
\(21\times x-x=140\)
\(20\times x=140\)
\(x=7\)
\(\frac{x+140}{x}+260=21+65\times4\)
\(\Rightarrow\frac{x}{x}+\frac{140}{x}+260=281\)
\(1+\frac{140}{x}+260=281\)
\(261+\frac{140}{x}=281\)
\(\frac{140}{x}=281-261\)
140/x = 20
x = 140 : 20
x = 7
Tìm x :
a, x x1999=1999x199,8
b,[x x 0,25 +1999]x2000 =[53+1999]x2000
c,71 + 65x4=\(\frac{x+140}{x}\)+260
a) Tính A=\(\frac{10}{56}+\frac{10}{140}+\frac{10}{260}+..........+\frac{10}{1400}\)
b) Tìm x thuộc Z , biết \(\frac{1.2+2.3+3.4+....+99.100}{x^2+\left(x^2+1\right)+\left(x^2+2\right)+.....+\left(x^2+99\right)}=50\frac{116}{131}\)
\(71+65x4=\frac{x+140}{x}+260\)
\(71+65\times4=\frac{x+140}{x}+260\)
\(71+260=\frac{x}{x}+\frac{140}{x}+260\)
\(71\) \(=1+\frac{140}{x}\)
\(70\) \(=\frac{140}{x}\)
\(x\) \(=2\)
tìm x :71+65x4=x+140/x+260
Trả lời:
71+65.4=x+140/x+260
x+140/x+260=71+65.4
x+140/x+260=71+260
x+140/x=71
x/x+140/x=71
1+140/x=71
140/x=71-1
140/x=70
x=140/70
x=2
vậy x=2
cậu ơi cái chỗ 71+65x4 là nhân 4 hay là 65 nhân x nhân 4 ạ
là 65 nhân 4 nghe
tìm X
71+65x4=X+140/X+260
tìm x biết
71 + 65x4=(x + 140):x +260
71+ 65x4 = (x+140) :x + 260
71 + 260 = x:x + 140:x + 260
71 + 260 - 1- 260 = 140x
70 = 140x
x= 70 : 140
x= 1/2
Tìm x
d)( x+1) +(x +4) +(x+7)+...+ (x+28)=155
e) (x+140): x + 260 =71+65x4
(x+1)+(x+4)+(x+7)+....+(x+28)=155
x+x+x+...+x+(1+4+7+....+28) = 155
10x + 145 = 155
=> 10x = 155 - 145
=> 10x = 10
=> x = 10:10
=> x =1
a) (x + 1 ) + ( x + 4 ) + ( x + 7 ) + ... + ( x + 28 ) = 155
( x + x + x + ... + x ) + ( 1 + 4 + 7 + ... + 28 ) = 155
10x + 145 = 145
10x = 155 - 145
10x = 10
=> x = 10 : 10
=> x = 1
tôi chỉ trả lời cho phần e thôi . Vi phan d của bạn tôi làm dài lam
Tìm x
\(Xx1999+1999x199,8\)
\(\left(Xx0,25+1999\right)x2000=\left(53+1999\right)x2000\)
\(71+65x4=\frac{x+140}{x}+260\)
Nhanh thì tick