`{(38/x + 64/y = 3),(19/x + 16/y = 1):}`
18 x 38 + 16 x 76 - 1 = ( 36 x 19 + 64 x 20 - 65 ) x X
18 x 38 + 16 x 76 -1 = ( 36 x 19 + 64 x 20 - 65 ) x X
( 36x 19 + 64 x 20 - 65 ) x X = 18x 38 + 16x 76 -1
1899 x X = 1899
X = 1899 / 1899
X = 1
18x38+16x76-1=[36x19+64x20-65]xX
[36x19+64x20-65]xX=18x38+16x76-1
1899xX=1899
x=1899/1899
x=1
giúp mik bài này với
( 18 + 38 + 16 * 76 - 1 ) =( 36 * 19 + 64 * 20 - 65 ) - x
* là dấu nhân nha !
(18+38+16*76-1)=(36*19+64*20-65)-x
=>(18+38+1216-1)=(684+1280-65)-x
=>1271=1899-x
=>1899-x=1271
x = 1899-1271
x=628
vậy x= 628
( 18 + 38 + 1216 - 1) = ( 684 +1280 - 65) - x
( 56 + 1216 - 1) = ( 1964 - 65) - x
1271 = 1899 - x
x = 1899 - 1271
x = 628
Tìm x,y biết: \(\dfrac{x}{19}=\dfrac{y}{21}\)và 2x -y = 34.
A.x = 38; y = 42; B.x = -38; y = -42; C. x = 21; y = 19 D.x = -21; y = -1
1. Tìm x,y biết : \(\dfrac{3}{5}x\) =\(\dfrac{2}{3}y\) và x2-y2= 38
2. Cho:\(\dfrac{x +16}{19}\)=\(\dfrac{y-25}{16}\)=\(\dfrac{z+9}{25}\) và 2x3-1=15. tính x+y+z
2. Tham khảo thêm tại đây nha bạn
https://hoc24.vn/hoi-dap/question/417550.html
( 100 x 44 + 50 x 64 ) x ( 37414,8 : 1000 + 2242,52 : 100
16 x 14,96 x 25 x ( 27 x 38 + 19 x146 )
( tính nhanh nha ) ( Bạn nào làm được mình cho 3 tick vì mình có 3 nick mà ^^ )
(100*44+50*54)*(37414.8/1000+2242.52/100)=265667.5052
16*14.96*25*(27*38+19*146)6142358
k minh nhe ban minh nhanh nhat
k minh di chu ban
chuc ban hoc gioi
thank you very much
cho A= ( 100 x 44 + 50 x 64 ) x ( 37414,8 : 1000 +2242,52 : 100 )
và B= ( 16 x 14,96 x 25 ) x ( 27 x 38 + 19 x 146 ). Tính A : B
Cho A = (100 x 44 + 50 x 64) x (37414,8 : 1000 + 2242,52 : 100)
B = (16 x 14,96 x 25) x (27 x 38 + 19 x 146)
Hãy tính A : B
1/2 x 1/4 + 3/4
3/4 x 5/6 x 8/15
12/19 : 17/38 x 16/9
(dấu chấm là dấu nhân nha e)
*\(\dfrac{1}{2}\). \(\dfrac{1}{4}\)+\(\dfrac{3}{4}\)
= \(\dfrac{1}{8}\)+\(\dfrac{3}{4}\)
= \(\dfrac{1}{8}\)+\(\dfrac{6}{8}\)= \(\dfrac{7}{8}\)
*\(\dfrac{3}{4}\).\(\dfrac{5}{6}\).\(\dfrac{8}{15}\)
= \(\left(\dfrac{3}{4}.\dfrac{8}{15}\right)\).\(\dfrac{5}{6}\)
= \(\dfrac{2}{5}\).\(\dfrac{5}{6}\)
= \(\dfrac{1}{3}\)
*\(\dfrac{12}{19}\): \(\dfrac{17}{38}\).\(\dfrac{16}{9}\)
= \(\dfrac{12}{19}\). \(\dfrac{38}{17}\).\(\dfrac{16}{9}\)= 2,5
1/2 x 1/4 + 3/4
3/4 x 5/6 x 8/15
12/19 : 17/38 x 16/9
1/2x1/4+3/4=7/8
3/4x5/6x8/15=1/3
12/19:17/38x16/9=128/51
1/8+3/4=7/8
5/8x8/15=1/3
24/17x16/9=128/51