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24/y=3/5*8/3
24/y=8/5
24:y=8/5
y=24;8/5
y=15
b,42/25:y/5=6/7
y/5=42/25:6/7
y/5=49/25
y:5=49/25
y=49/25*5
y=49/5=9,8
\(\frac{24}{y}:\frac{8}{3}=\frac{3}{5}\)
\(\Rightarrow\frac{24}{y}=\frac{3}{5}\times\frac{8}{3}\)
\(\Rightarrow\frac{24}{y}=\frac{8}{5}\)
\(\Rightarrow y=\frac{8}{5}\times24=\frac{192}{5}\)
b , \(\frac{42}{25}:\frac{y}{5}=\frac{6}{7}\)
\(\Rightarrow\frac{y}{5}=\frac{6}{7}\times\frac{42}{25}=\frac{36}{25}\)
\(\Rightarrow y=\frac{36}{25}\times5=\frac{36}{5}\)
a) 7 , 25 × y + 5 , 6 = 58
y + 5 , 6 = 58 : 7 , 25
y = 8 − 5 , 6
y = 2 , 4
b) 470 , 04 : y = 24
y = 470 , 04 : 24
y = 19 , 585
a) x + 17,67 = 100 - 63,2 b) x : 7,5 = 3,7 + 4,1 c) 470,04 : x = 24
=> x + 17,67 = 36,8 => x : 7,5 = 7,8 => x = 470,04 : 24
=> x = 36,8 - 17,67 => x = 7,8 x 7,5 => x = 19,585
=> x = 19,13 => x = 58,5
a)
x + 17.67 = 100 - 63.2
x + 17.67 = 36.8
x = 36.8 - 17.67
x = 19.13
b)
x : 7.5 = 3.7 + 4.1
x : 7.5 = 7.8
x = 7.8 x 7.5
x = 58.5
c)
470.04 : x = 24
x = 470.04 : 24
x = 19.585
A)429678
B)KHÔNG TÍNH ĐC BẠN NHÉ!
C)6638,71
D)58,7
E)748
H)21
TÌM X
a)x=3,5
b)13,6
c)19,585
a) \(\dfrac{5}{y}=\dfrac{1}{2}\)
\(y=\dfrac{5\times2}{1}=10\)
b) \(\dfrac{42}{25}:\dfrac{y}{5}=\dfrac{6}{5}\)
\(\dfrac{y}{5}=\dfrac{42}{25}:\dfrac{6}{5}\)
\(\dfrac{y}{5}=\dfrac{7}{5}\)
\(y=7\)
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
a , 7 , 25 × y + 5 , 6 = 58 y + 5 , 6 = 58 : 7 , 25 y = 8 − 5 , 6 y = 2 , 4 b , 470 , 04 : y = 24 y = 470 , 04 : 24 y = 19 , 585