a) (x+1)+(x+2)+(x+3)+...+(x+100)
=100.x+(1+2+3,..+100)
=100.x+100.101/2
=>
100x+101.50=5750
100x=5750-5050=700
x=7
b) 433 - (15x + 70) = 33
(15x + 70) = 433 - 33
(15x + 70) = 400
15x = 400 - 70
15x = 330
x = 330 : 15
x = 22
c) (13 + x ) . 8 = 136
(13 + x ) = 136 : 8
(13 + x ) = 17
x = 17 - 13
x = 4
d) 3x - 35 = 40
3x = 40 + 35
3x = 75
x = 75 : 3
x = 25
các bạn ơi hãy k cho mk và kban các bạn nhé!!!! I love you!!!! thank for reading. chúc các bạn học giỏi
( x + 1 ) + ( x + 2 ) + ( x + 3 ) + ... + ( x + 100 ) = 5750
x x 100 + ( 1 + 2 + 3 + ... + 100 ) = 5750
x x 100 + 5050 = 5750
x x 100 = 5750 - 5050
x x 100 = 700
x = 700 : 100
x = 7
Mấy cái dưới dễ tự làm ik chứ bn
(x+1)+(x+2)+(x+3)+...(x+100)=5750
=>(x+x+x+...+x)+(1+2+3+...+100)=5750
=>100x+5050=5750
=>100x=700
=>x=7
433-(15x+70)=33
=>15x+70=400
=>15x=330
=>x=22
(13+x)*8=136
=>13+x=17
=>x=4
3x-35=40
=>3x=75
=>x=25
(x+1)+ (x+2)+ (x+3)+......+(x+100)=5750
(x+x+x+...+)+(1+2+3+...+100) =5750
100x + 5050 =5750
100x =5750 - 5050
100x =700
x =700 : 100
x =7
433-(15x+70)= 33
\(\left(15x+70\right)=433-33\)
\(\left(15x+70\right)=400\)
\(15x=400-70\)
\(15x=330\)
\(x=330\div15\)
\(x=22\)
(13+x).8= 136
\(13+x=136\div8\)
\(13+x=17\)
\(x=17-13\)
\(x=4\)
3x- 35=40
\(3x=40+35\)
\(3x=75\)
\(x=75\div3\)
\(x=25\)
a) (x+1)+...(x+100)=5750
=>100x+1+2+...+100=5750
=>100x + \(\frac{100.101}{2}\)= 5750
=>100x + 5050 = 5750
=> 100x = 5750-5050 =700
=> x=700:100=7
b) 433-(15x+70)=33
=>15x+70 = 433-33
=> 15x+70 = 400
=>15x = 330
=>x = 330:15 =22
c) (13+x).8=136
=> 13+x = 136:8 = 17
=>x = 17-13 = 4
d) 3x -35=40
=>3x = 40+35 = 75
=> x= 75:3 =25
a) <=> x+1+x+2+x+3+....+x+100=5750
<=>100x+1+2+3+....+100 =5750
<=>100x+5050 =5750
<=>100x =5750-5050=700
<=>x 700:100=7
Vậy x=7
b)<=>15x+70=433-33=400
<=>15x =400-70=330
<=>x =330:15=22
Vậy x=22
