Tính:
a)720:[41-(2x+5)]=23.5
b)92.4-27=(x+350):x+315
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697:(15x+364):x=17
=> 15+360:x = 697:17=41
=> 360:x=41-15=26
=> x=360:26=180/13
92.4-27=(x+350):x+315
=> 1+350:x+315=341
=> 350:x = 341 -316=25
-> x=350:25=14
720:(41-(2x-51)=23.5
=> 41-(2x-51)= 720 :40=18
=> 2x=41-18+51=74
=> x=74:2=37
(x+1)+(x+2)+(x+3)+...+(x+100)=5750
=>(x+x+...+x) +(1+2+3+..+99+100)=5750
=> 100.x +(100+1).100:2= 5750
=>100.x= 5750-5050=700
=> x=700:100=7
( L-i-k-e )
697 : (15x + 364) : x = 17
=> 15 + 360 : x = 697 : 17 = 41
=> 360 : x = 41 - 15 = 26
=> x = 360 : 26 = 180/13
92.4 - 27 = (x + 350) : x + 315
=> 1 + 350 : x + 315 = 341
=> 350 : x = 341 - 316 = 25
-> x = 350: 25 = 14
720 : (41 - (2 x - 51) = 23.5
=> 41 - (2 x -51) = 720 : 40 = 18
=> 2x = 41 - 18 + 51 = 74
=> x = 74 : 2 = 37
(x + 1) + (x + 2) + (x + 3) +...+ (x + 100) = 5750
=>(x + x +...+ x) +(1 + 2 + 3 +...+ 99 + 100) = 5750
=> 100.x + (100 + 1).100 : 2 = 5750
=>100.x = 5750 - 5050 = 700
=> x = 700 : 100 = 7
Bài 1:
a, \(92.4-27=\left(x+350\right):x+315\)
\(\Rightarrow\left(x+350\right).\dfrac{1}{x}=92.4-27-315\)
\(\Rightarrow1+\dfrac{350}{x}=26\)
\(\Rightarrow350:x=25\Rightarrow x=14\)
b, \(720:\left[41-\left(2x+5\right)\right]=2^3.5\)
\(\Rightarrow720:\left(41-2x-5\right)=8.5\)
\(\Rightarrow720:\left(36-2x\right)=40\)
\(\Rightarrow36-2x=18\Rightarrow2x=18\Rightarrow x=9\)
Chúc bạn học tốt!!!
1)
a)
\(92.4-27=(x+350):x+315\)
\(368-27=(x+350):x+315\)
\(341=(x+350):x+315\)
\((x+350):x=341-315=26\)
\(26x=x+350\)
\(25x=350\)
\(x=14\)
b)
\(720:[41-(2x+5)]=2^3.5\)
\(720:[41-(2x+5)]=40\)
\(41-(2x+5)=18\)
\(2x+5=23\)
\(2x=18\)
\(x=9\)
bây h bn mún thì mình 3 chiếc trc ik
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
a) 720:[41-(2x-5)=8x5
720:[41-(2x-5)=40
41-(2x-5)=720:40
41-(2x-5)=18
2x-5 =41-18
2x-5 = 23
2x =23+5
2x =28
x =28:2
x =14
a)720:[41-(2x+5)]=23.5
720:[41-(2x+5)]=8.5
720:[41-(2x+5)]=40
41-(2x+5)=720:40
41-(2x+5)=18
2x=18-5
2x=13
x=13:2
x=6,5
b)92.4-27=(x+350):x+315
=>(x+350):x+315=92.4-27
(x+350):x+315=368-27
(x+350):x+315=341
tới đấy mk ko biết làm nữa