Tim x
X x 400 + X x 15 = 230
Cau 3 (2 diem). Tim so tu nhien x, biet:
a. 123 - x =38
b. (x+15) - 7 =33
c. 3x+3 - 13=230
`123-x=38`
`=> x= 123-38`
`=>x=85`
Vậy `x=85`
__
`(x+15) -7=33`
`=>x+15=33+7`
`=>x+16= 40`
`=>x=40-16`
`=>x=24`
Vậy `x=24`
__
`3^(x+3) -13=230`
`=> 3^(x+3) = 230+13`
`=>3^(x+3)=243`
`=> 3^(x+3)=3^5`
`=> x+3=5`
`=>x=5-3`
`=>x=2`
Vậy `x=2`
15 x ( 32 - 24 : x ) - 230 = 70
\(15\times\left(32-24\div x\right)-230=70\)
\(15\times\left(32-24\div x\right)=300\)
\(32-24\div x=20\)
\(24\div x=12\)
\(x=2\)
\(15\times\left(32-24:x\right)-230=70\)
\(15\times\left(32-24:x\right)=70+230\)
\(15\times\left(32-24:x\right)=300\)
\(32-24:x=300:15\)
\(32-24:x=20\)
\(24:x=32-20\)
\(24:x=12\)
\(x=24:12\)
\(x=2\)
\(#WendyDang\)
\(15\cdot\left(32-24:x\right)=300\)
\(32-24:x=300:15=20\)
\(24:x=32-20=12\)
\(x=24:12=2\)
230 - 35 - 15 = ? x 2 = ? x ? = ?
230 - 35 - 15 = ? x 2 = ? x ? = ?
= 230 - { 35 + 15 } = ? x 2 = ? x ?
= 230 - 50 = ? x 2 = ? x ?
= 180 x 2 = ? x ?
= 360 x 360
= ?
230 ‐ 35 ‐ 15 = ? x 2 = ? x ? = ?
= 230 ‐ { 35 + 15 } = ? x 2 = ? x ?
= 230 ‐ 50 = ? x 2 = ? x ?
= 180 x 2 = ? x ?
= 360 x 360
Tìm x biết:
15 x ( 32 -24 : x ) -230 = 70
0,6 (x - 3,7) = 4,8
15*(32-24:x)-230=70
15*(32-24:x)=70+230
15*(32-24:x)=300
32-24:x=300:15
32-24:x=20
24:x=32-20
24:x=12
x=24:12
x=2
Tim x :
a, 90 va 26 cung chia het cho x va 10 < x< 30
b, 70 , 84 cung chia het cho x va x>8
c,150 , 84 , 30 deu chia het cho x va 0 < x <16
d, x chia het cho 10 , 15 va x < 100
e, x chia het cho 15 , 14 , 20 va 400<x<1200
a; 90 ⋮ \(x\) và 26 ⋮ \(x\) ⇒ \(x\in\) ƯC(90; 26)
90 = 2.32.5; 26 = 2.13
ƯCLN(90; 26) = 2
\(x\in\) Ư(2) = {-2; -1; 1; 2}
Vì 10 < \(x\) < 30 nên \(x\) \(\in\) \(\varnothing\)
c; 150 ⋮\(x\) ; 84 ⋮ \(x\); 30 ⋮ \(x\)
\(x\in\) ƯC(150; 84; 30)
150 = 2.3.52; 84 = 22.3.7; 30 = 2.3.5
ƯCLN(150;84;30) = 2.3 = 6
\(x\in\) Ư(6) = { 1; 2; 3; 6}
Vì 0 < \(x< 16\)
Vậy \(x\in\) {1; 2; 3; 6}
70 ⋮ x và 84 ⋮ x
⇒x \(\in\) ƯC(70,26)
70 = 2 . 5 . 7
84 = 22 . 3 . 7
UCLN(70,84) = 2 . 7 = 14
UC(70,84) = Ư(14) {1;2;7;14}
x>8 ⇒ x\(\in\){14}
Vậy x \(\in\) {14}
Tim x:
a) x x 0,01 =0,9 x 100
b) x :0,1 = 0,25 x 400
a, x . 0,01 = 0,9 . 100
x . 0,01 = 90
x = 90 : 0,01
x = 9000
b, x : 0,1 = 0,25 . 400
x : 0,1 = 100
x = 100 . 0,1
x = 1000
hok tốt ~
a) x . 0,01 = 0,9 . 100
x . 0,01 = 90
x = 90 : 0,01
x = 9000
b) x : 0,1 = 0,25 . 400
x : 0,1 = 100
x = 100 . 0,1
x = 1000
x - 543 = 230 + 400
k mk nhé, mk k lại
\(x-543=230+400\)
\(x-543=630\)
\(x=630+543\)
\(x=1173\)
x - 543 = 230 + 400
x - 543 = 630
x = 630 + 543
x = 1173
k mik nha, mik sẽ k lại bn
mik hứa, nhớ gửi tin nhắn nha
x = 87 nha
bạn trả lời đi mình tk cho
Tim x
50 -2 x ( x +1 )=20
Tinh nhanh
147+230+53+70
7*85+27*7-7*12
58*75+58*50-58*25
Tìm x, biết:
a) 230 + 2 4 + ( x - 5 ) = 315 . 2018 0 ;
b) 707 : 2 x - 5 + 74 = 4 2 - 3 2 ;
c) [(6x - 12): 3].32 = 64;
d) (x:7 + 15).23 = 391