200 x ( 321 : X ) = 987
X = ????????????????????
Tìm x biết, 321 - (116 + x ) = 200
tìm x
(3x-1) : 13 = 14
5x + 2x= 98
7x - 4x = 2022
mình cần gấp giúp mình
\(\left(3x-1\right):13=14\)
\(\Rightarrow3x-1=182\)
\(\Rightarrow3x=183\)
\(\Rightarrow x=61\)
==========
\(5x+2x=98\)
\(\Rightarrow7x=98\)
\(\Rightarrow x=14\)
=======
\(7x-4x=2022\)
\(\Rightarrow3x=2022\)
\(\Rightarrow x=674\)
`(3x-1) : 13 = 14`
`=>3x-1=14xx13`
`=>3x-1=182`
`=> 3x=182+1`
`=> 33x=183`
`=>x=183:3`
`=>x=61`
Vậy `x=61`
`5x+2x=98`
`=> (5+2)x=98`
`=> 7x=98`
`=>x=98:7`
`=>x=14`
Vậy `x=14`
`7x-4x=2022`
`=> (7-4)x=2022`
`=> 3x=2022`
`=>x=2022:3`
`=>x=674`
Vậy `x=674`
Tìm x ∈ N, biết:
a, x ∈ B(5), x < 20
b, x ⋮ 24; x ⋮ 45; 200 < x < 500
c, 452 = px+32; 321 = qx+21 (p,q ∈ N*)
a, Ta có: x ∈ B(5) = {0;5;10;15;20;25;...}
Mà x < 20 => x ∈ {0;5;10;15}
b, Ta có: x ⋮ 24; x ⋮ 45 => x ∈ BC{24;45}
24 = 2 3 . 3 ; 45 = 3 2 . 5 => BCNN(24;45) = 2 3 . 3 2 . 5 = 360
=> BC(24;45) = B(360) = {0;360;720;...}
Mà 200 < x < 500 => x = 360
c, Ta có:
452 = px+32 => 420 ⋮ x
321 = qx+21 => 320 ⋮ x
=> x ∈ ƯC(420;320)
420 = 2 2 . 3 . 5 . 7
320 = 2 6 . 5
=> ƯCLN(420;320) = 20 = 2 2 . 5
=> ƯC(420;320) = Ư(20) = {1;2;4;5;10;20}
Vậy x ∈ {1;2;4;5;10;20}
321 x 321 x 321 x 321 x 0 =
321x321x321x321x0=0
cho 987x+ 1991y chia 9 dư 2
tìm số dư của 87x + 191y khi chia cho 9
giúp mik pls!!!!!!!!!!
Ta có \(87x+191y=987x-900x+1991y-1800y\)
\(\Leftrightarrow87x+191y=\left(987x+1991y\right)-9\left(100x+200y\right)\)
Ta có \(9\left(100x+200y\right)⋮9;\left(987x+1991y\right):9R2\)
\(\Rightarrow\left(87x+191y\right):9R2\)
Tính theo mẫu?
Mẫu: 26 x 4 + 26 x 3 + 26 x 2 26 x 4 + 26 x 3 + 26 x 2 = 26 x (4 + 3 + 2) = 26 x 9 = 234. |
321 x 3 + 321 x 5 + 321 x 2
321 x 3 + 321 x 5 + 321 x 2
= 321 x (3 + 5 + 2)
= 321 x 10
= 3 210.
321 x 3 + 321 x 5 + 321 x 2
= 321 x (3 + 5 + 2)
= 321 x 10
= 3210
132/321 x 132/321=?
Giúp mik ik nha =3
123 - ( x + 12 ) . 5 = 465
321 + ( 123 - x ) = 321
12345 : ( x + 2346 ) = 5
Giải: a/ ->123- (x.5 + 60) =465 ->123-x.5-60=465 ->123-60-465=x.5 ->-402=x.5 =>x= -402/5 b/ ->321+123-x=321 444-x=321 => x=123 c/ -> (x+2346)=12345:5=2469 ->x=2469-2346 =123 Có điều, đây có phải toán lớp 5 ko, mình thấy có phép âm
x : 0,25 + x :0,5 + x + x : 0,01 = 321
\(x:0,25+x:0,5+x+x:0,01=321\\ x:\dfrac{1}{4}+x:\dfrac{1}{2}+x+x:\dfrac{1}{100}=321\\ x\times4+x\times2+x\times1+x\times100=321\\ x\times\left(4+2+1+100\right)=321\\ x\times107=321\\ x=\dfrac{321}{107}=3\)
`x : 0,25 + x :0,5 + x + x : 0,01 = 321`
`=> x xx 4 +x xx 2 +x xx1 + x xx 100=321`
`=> x xx(4+2+100+1)=321`
`=>x xx 107=321`
`=>x=321:107`
`=>x=3 `