tim x
a,679 : \(\frac{15\times x+364}{x}\)=17
b,92 . 4 - 27 =\(\frac{a+350}{a}+375\)
tim x\(\in\)N, biet
a)697:\(\frac{15.x+364}{x}\)=17
b)92.4-27=\(\frac{x+350}{x}\)+315
khong can lam nua dau minh biet lam roi
tìm x
a, 697 : 15 . x + 364 / x =17
b, 92 . 4 - 27 = x + 350 / x + 315
\(x^{15}=x\)
\(\left(x-5\right)^4=\left(x-5\right)^6\)
\(697:\frac{15\cdot a+364}{a}=17\)
\(92\cdot4-27=\frac{a+350}{a}+315\)
a) x15 = x => x15 - x = 0 => x. x14 - x = 0 => x. (x14 - 1) = 0 => x = 0 hoặc x14 - 1 = 0
x14 - 1 = 0 => x14 = 1 => x = 1 hoặc x = -1
b) => (x - 5)4 - (x - 5)6 = 0 => (x - 5)4 - (x - 5)2. (x - 5)4 = 0 => (x - 5)4 . [1 - (x - 5)2] = 0
=> (x - 5)4 = 0 hoặc 1 - (x - 5)2 = 0
+) (x - 5)4 = 0 =>x - 5 = 0 => x = 5
+) 1 - (x - 5)2 = 0 => (x - 5)2 = 1 => x - 5 = 1 hoặc x - 5 = -1
=> x = 6 hoặc x = 4
Vậy...
c) => \(\frac{15.a+364}{a}=\frac{697}{17}\Rightarrow15+\frac{364}{a}=41\Rightarrow\frac{364}{a}=41-15=26\)=> a = 364: 26 = 14
d) => 368 - 27 = 1 + \(\frac{350}{a}\) + 315
=> 341 = 316 + \(\frac{350}{a}\)=> 350/a = 341 - 316 = 25 => a = 350/25 = 14
tìm số tự nhiên x biết:
a) 697 : \(\dfrac{15:x+364}{x}\) = 17
b) 92 : 4 - 27 = \(\dfrac{x+350}{x}\) + 315
c) 720 : [41 - ( 2x - 5 )] = 23 . 5
mọi ngườ giúp em câu này với ạ .
b, 92 : 4 - 27 = \(\dfrac{x+350}{x}\) + 315
23 - 27 = 1 + \(\dfrac{350}{x}\) + 315
316 + \(\dfrac{350}{x}\) = -4
\(\dfrac{350}{x}\) = - 316 - 4
\(\dfrac{350}{x}\) = -320
-320 \(x\) = 350
\(x\) = 350: (-320)
\(x\) = - \(\dfrac{35}{32}\) (loại)
Vậy \(x\) \(\in\) \(\varnothing\)
c, 720 : [ 41 - (2\(x\) - 5)] = 23.5
41 - (2\(x\) - 5) = 720 : (23.5)
41 - 2\(x\) + 5 = 18
46 - 2\(x\) =18
2\(x\) = 46 - 18
2\(x\) = 28
\(x\) = 28: 2
\(x\) = 14
Vậy \(x\) = 14
1.TÌM X,
A. 697:\(\frac{15.X+364}{X}\)=17
B. 92.4-27=\(\frac{X+350}{X}\)+315
a) \(697:\frac{15X+364}{X}=17\)
\(\Rightarrow\frac{15X+364}{X}=697:17=41\)
\(\Rightarrow15X+364=41X\)
\(\Rightarrow364=41X-15X=26X\)
\(\Rightarrow X=14\)
A.suy ra: 15x+364/x=41
suy ra: 15x/x+364/x=41
suy ra: 15 + 364/x=41
suy ra: 364/x =26
suy ra: 364:x=26
suy ra: x= 14 (T/M)
B. 92.4-27=x+350/x+315
suy ra: 341=x/x+ 350/x +315
suy ra: 26 =1+350/x
suy ra: 25=350/x
suy ra: 350:25=x
suy ra: 14=x (T/M)
Vậy a. x=14
b. x=14
a) 679 : 15.x+364/x = 17
b) 94.4 - 27 = x+350/x +315
c) 720 (41-(2x-5)) = 2^2.5
d) (x+1)(x+2)(x+3)+...+(x+100)=57500
Viết cách giải ra nhé
1500 : [ ( 30x + 40 ) : x ] = 30
92 x 4 - 27 = x + 350 :x + 315
697 : 15x + 364 : x = 17
tìm x:
\(697:\frac{15.x+364}{x}=17\)
\(92.4-27=\frac{x+350}{x}+315\)
tìm x:
\(697:\frac{15.x+364}{x}=17\)
\(92.4-27=\frac{x+350}{x}+315\)
\(697:\frac{15x+364}{x}=17\)
\(\frac{15x+364}{x}=697:17=41\)
\(\frac{15x}{x}+\frac{364}{x}=41\)
\(15+\frac{364}{x}=41\)
\(\frac{364}{x}=41-15=26\)
\(x=364:26=14\)
\(92.4-27=\frac{x+350}{x}+315\)
\(\frac{x+350}{x}+315=341\)
\(\frac{x+350}{x}=341-315=26\)
\(\frac{x}{x}+\frac{350}{x}=26\)
\(1+\frac{350}{x}=26\)
\(\frac{350}{x}=26-1=25\)
\(x=350:25=14\)