(3xy-0,8):y+14,5=15

(3xy-0,8):y=15-14,5

3xy:y-0,8:y=0,5

3x-0,8:y=0,5

Còn lại làm tiếp đi!

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

tích nha mỏi tay quá

Giúp mk đi.

có ai giúp tôi ko?

a)y:0,01=285:10

=>y=\(\frac{285:10}{0,01}\)=2850

b)\(\frac{1}{4}\times y=3-\frac{2}{5}\)

=>\(\frac{1}{4}\times y=\frac{13}{5}\)

=>y=\(\frac{13}{5}:\frac{1}{4}=\frac{13}{5}\times4=\frac{52}{5}\)

ra nhiều thế

a/b nhân 4 cộng 1/6 = 17/6 số phải tìm là bao nhiêu

ta có \(\frac{x}{3}=\frac{y}{8}=\frac{z}{5}\)

=> \(\frac{3x}{9}=\frac{y}{8}=\frac{z}{5}=\frac{3x+y-z}{9+8-5}=\frac{14}{12}=\frac{7}{6}\)

=> \(\frac{x}{3}=\frac{y}{8}=\frac{z}{5}\)\(=\frac{7}{6}\)

=> \(x\)\(=\frac{7\cdot3}{6}=\frac{21}{6}=\frac{7}{2}\)

=> \(y=\frac{7\cdot8}{6}=\frac{56}{6}\)

=>\(z=\frac{7\cdot5}{6}=\frac{35}{6}\)

số xấu vậy em