480÷x-120÷x=60
Tìm x thuộc số tự nhiên
1440 : [120-(3.x9) ] =120
120 + [ ( 999-9.x) : 60 ] . 24=480
\(1440:\left[120-\left(3.9x\right)\right]=120\) \(120+\left[\left(999-9x\right):60\right].24=480\)
\(120-\left(3.9x\right)=1440:120\) \(\left[\left(999-9x\right):60\right].24=360\)
\(120-\left(3.9x\right)=12\) \(\left(999-9x\right):60=15\)
\(3.9x=120-12\) \(999-9x=900\)
\(3.9x=108\) \(9x=999-900\)
\(9x=108:3\) \(9x=99\)
\(9x=36\) \(x=99:9\)
\(x=4\) \(x=11\)
120 +[(999-9.x): 60].24=480
120 +[(999-9.x): 60].24=480
=> [(999-9.x): 60].24=480 - 120
=> [(999-9.x): 60].24= 360
=> (999-9.x): 60 = 360 : 24
=> (999-9.x): 60 = 15
=> 999 - 9.x = 15.60
=> 999 - 9x = 900
=> 9x = 999 - 900
=> 9x = 99
=> x = 99 : 9
=> x = 11
Tìm x biết 120+[(999-9x):60].24=480
120+[(999-9x):60].24=480
[(999-9x):60].24 = 480 - 120
[(999-9x):60].24 = 360
[(999-9x):60] = 360 : 24
[(999-9x):60] = 15
(999-9x) = 15 x 60
(999-9x) = 900
9x = 999 - 900
9x = 99
x = 99 : 9
x = 11
120+[(999-9x):60]=480-120
[(999-9x):60].24=360
(999-9x):60=360:24
(999-9x):60=15
(999-9x)=15.60
999-9x=900
990x=900
x=990:900
x=?
120+[(999-9x):60].24=480
[(999-9x):60].24 = 480 - 120
[(999-9x):60].24 = 360
[(999-9x):60] = 360 : 24
[(999-9x):60] = 15
(999-9x) = 15 x 60
(999-9x) = 900
9x = 999 - 900
9x = 99
x = 99 : 9
x = 11
Tìm x
120+ [ (999-9x) /60 ]= 480/24
Tình bày ra nhé
120+[(999-9x)/60]=480/24
120+[(999-9x)/60]=20
999-9x=20-120
999-9x=-100
9x=999-(-100)
9x=1099
x=1099/9
Vậy x=1099/9
30+60+120+240+480+860+....+3000
30+60+120+240+480+860+....+3000
= 10 x (3+6+12+24+48+.....+300)
= 10 x3(1+2+4+8+.....+100)
= 30 x 50 x 101
= 151500
giup minh 2 cau nay nhe ^^
1) 120 + ( (999-9x) : 60 ) x ( day la dau nhan ) 24= 480. Tim x
2) 3( x-9 ) + 15 = 12 + 243 : 32. Tim x
Giup mk nhe>.<!!!
Mk dang GAP!!!!!
1) 120 + ( 999 - 9x) : 6) = 20
999 - 9x : 6 = 140
999- 9x = 840
9x = 999 - 840
x = 17 dư 7
1. Tìm x, biết :
a. 1440: [120-(3x+9)] =120
b. 120+ [(999-9x):60].24 =480
c. (3x-48).6 =33.32+23.32 = 122
d. x10 = x
e. (2x-15)5 = (2x -15)3
f. 6.2x + 7.2x = 13.29
a. 1440 : [ 120 - (3x + 9 ) ] = 120
120 - (3x + 9) = 1440 : 120 = 12
3x + 9 = 120 - 12 = 108
3x = 108 - 9 = 99
x = 99 : 3 = 33
b. 120 + [ ( 999 - 9x ) : 60 ] . 24 = 480
[ ( 999 - 9x ) : 60 ] . 24 = 480 - 120 = 360
( 999 - 9x ) : 60 = 360 : 24 = 15
( 999 - 9x ) = 15 . 60 = 900
9x = 999 - 900 = 99
x = 99 : 9 = 11
Tìm n thuộc N, biết: 120 + [(999 - 9n).60] = 480
hình như đề sai đó bạn mình tính hoài mà không ra số tự nhiên
(17x-26).52016=52018
7x-2x=62+44:11
7x-4.710=3.710
2x+3+2x=144
720:[41-(2x-5)]=40
120+[(999-9x):60].24=480
7x-2x=6 mũ 2 +44:11
5x=36+4
5x=40
x=40:5=8