Ai nhanh mk tick cho

tui 

a) Y x 4 - Y : 4 - 24,76 = 190,48 : 2

Y x 4 - Y x 1/4 - 24,76 = 95,24

Y x (4 - 1/4) = 95,24 + 24,76

Y x 15/4 = 120

Y = 120 : 15/4 = 32

x+x/3*15=324/4+106/6

a: \(2\dfrac{2}{10}=2,2\)

\(4\dfrac{31}{100}=4,31\)

9/10=0,9

51/10=5,1

75/100=0,75

125/100=1,25

1075/1000=1,075

\(14\dfrac{17}{100}=14,17\)

b: 1/2=0,5

3/4=0,75

4/5=0,8

5/8=0,625

\(2\dfrac{1}{2}=2,5\)

\(3\dfrac{1}{4}=3,25\)

\(1\dfrac{3}{5}=1,6\)

\(4\dfrac{3}{8}=4,375\)

\(\frac{180\times123+9\times4567\times2+5310\times6}{\left(2+4+6+...+20+22\right)+48}\)

\(=\frac{18\times123+18\times4567+5310\times6}{132}\)

\(=\frac{116280}{132}=\frac{9690}{11}\)

mình bí rồi 

( y+1) + ( y+2) + (y+3) + ( y+4)+...+( y+100) = 5750

=>( 100 x y )+ ( 1+2+3+4+ ...+ 100) = 5750

100 x y +[ (1+100) .100 : 2 ]= 5750

100 x y + 5050 = 5750

100 x y              = 5750 - 5050

100 x y               = 700

y                        = 700 : 100

y                        = 7

(y+1) +(y+2) + (y+3) + ( y+4) + ...+ (y+100)= 5750

............................

y=7

Hk tốt

Ta có : \(\frac{x}{4}=\frac{y}{7}\) 

\(\Rightarrow\frac{x^2}{16}=\frac{y^2}{49}=\frac{3x^2}{48}=\frac{4y^2}{196}=\frac{3x^2-4y^2}{48-196}=\frac{100}{-148}=-\frac{25}{37}\)

Thay vào là ra nhé !:D

Cái chỗ Nguyễn Quang Trung đúng ròi

\(\Rightarrow\hept{\begin{cases}\frac{x}{4}=-\frac{25}{37}\\\frac{y}{7}=-\frac{25}{37}\end{cases}}\Rightarrow\hept{\begin{cases}x=-\frac{100}{37}\\y=-\frac{175}{37}\end{cases}}\)

a)100-9:(372:3.y-1)-14=83

<=>100-9:(124y-1)-14=83

<=>86-9:(124y-1)=83

<=>9:(124y-1)=3

<=>124y-1=3

<=>124y=4

<=>y=\(\frac{1}{31}\approx0,3223\)

b)7260-120:24.y+924=528,3

<=>8184-5y=528,3

<=>5y=7655,7

<=>y=1531,14

c)2000-52:(615:3:y-15)-14=1984

<=>1986-52:(205:y-15)=1984

<=>52:(205:y-15)=2

<=>205:y-15=26

<=>205:y=41

<=>y=5

d)y+y.1/3+5/18=7/18

<=>4/3y=1/9

<=>y=1/12

e)13/15-(5/21+y)7/12=7/10

<=>7/12.(5/21+y)=1/6

<=>5/36+7/12y=1/6

<=>7/12y=1/36

<=>y=1/21\(\approx\)0,4762

h)y+2.y+3.y+...+10.y=49,5

<=>55y=49,5

<=>y=0,9

i)y.(1975/8.9+1885/9.10+1755/10.11+1579/11.12)=1/24

<=>7991,364899y=1/24

<=>y=33/6329161

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