a728:[41-(2x-5)]=8.5
b (x+1)+(x+2)+(x+3)+...+(x+100)=5750
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a ) (x+1)+...+(x+100)
= (x+x+..+x)+(1+..+100)
=100x + (100+1).100:2
=100x + 5050
=5750
<=> 100x = 5750 - 5050
<=> 100x = 700
=> x = 700 : 100 = 7
b) 720 : [ 41-(2x-5)]= 40
41-(2x-5) = 720 : 40
41-(2x-5) = 18
2x-5 = 41-18= 23
2x = 23+5 = 28
=> x = 28:2 = 14
Chúc Bạn Học Tốt
Nếu sai thì thông cảm ạ
a)720:[41-(2x-5)]=40
41-(2x-5)=720:40
41-(2x-5)=18
2x-5=41-18
2x-5=23
2x=28
x=14
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
(x+1)+(x+2)+...+(x+100)=5750
(x+x+x+...+x)+(1+2+...+100)=5750
100x+5050=5750
100x=5750-5050
100x=700
x=700:100
x=7
(x+2)+(x+4)+...+(x+100)=3500
(x+x+..+x)+(2+4+...+100)=3500
50x+2550=3500
50x=3500-2500
50x=950
x=950:50
x=19
\(\left(x+1\right)+\left(x+2\right)+\left(x+3\right)+...+\left(x+100\right)=5750\)
\(\left(x+x+x+...+x\right)+\left(1+2+3+...+100\right)=5750\)
\(\Rightarrow100x+5050=5750\Rightarrow x=5750-5050\)
\(100x=700\Rightarrow x=700:100=7\)