tim y
24/y : 8/=3/5
42/25:y/5=6/5
ai nhanh minh tick
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a.\(y:\dfrac{4}{5}=\dfrac{11}{8}\)
\(y=\dfrac{11}{8}\times\dfrac{4}{5}\)
\(y=\dfrac{11}{10}\)
b.\(\dfrac{11}{3}-y=\dfrac{1}{9}\)
\(y=\dfrac{11}{3}-\dfrac{1}{9}\)
\(y=\dfrac{32}{9}\)
c.\(\dfrac{1}{7}\times x=\dfrac{8}{5}\)
\(x=\dfrac{8}{5}:\dfrac{1}{7}\)
\(x=\dfrac{56}{5}\)
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 , \(\frac{42}{25}:\frac{y}{5}=\frac{6}{7}\)
\(\Rightarrow\frac{y}{5}=\frac{6}{7}\times\frac{42}{25}=\frac{36}{25}\)
\(\Rightarrow y=\frac{36}{25}\times5=\frac{36}{5}\)
\(a,\frac{42}{25}:\frac{y}{5}=\frac{6}{5}\)
\(\frac{y}{5}=\frac{42}{25}:\frac{6}{5}\)
\(\frac{y}{5}=\frac{42}{25}\times\frac{5}{6}\)
\(\frac{y}{5}=\frac{7}{5}\)
\(\Leftrightarrow5y=7.5\)
\(5y=35\)
\(y=7\)
Bài 1:
Ta có:
\(y-x=25\Rightarrow y=25+x\)
Mà \(7x=4y\Rightarrow7x=4\cdot\left(25+x\right)\)
\(7x=100+4x\)
\(\Rightarrow7x-4x=100\)
\(3x=100\)
\(x=\frac{100}{3}\)
bài 1 :
Ta có: 7x=4y ⇔ x/4=y/7
áp dụng tính chất dãy tỉ số bằng nhau ta có
x/4=y/7=(y-x)/(7-4)=100/3
⇒x= 4 x 100/3=400/3 ; y = 7 x 100/3=700/3
bài 2
ta có x/5 = y/6 ⇔ x/20=y/24
y/8 = z/7 ⇔ y/24=z/21
⇒x/20=y/24=z/21
ADTCDTSBN(bài 1 có)
x/20=y/24=z/21=(x+y)/(20+24)=69/48=23/16
⇒x= 20 x 23/16 = 115/4
y= 24x 23/16=138/2
z=21x23/16=483/16
5.7.77-7.60+49.25-15.42
= 5.7.77-7.5.12+7.7.5.5-3.5-3.5.6.7
= 35.77-35.12+35.35-35.18
= 35.(77-12+35-18)
= 35.82
= 2870
A.y/5 x 3/7 x 3 = 27/35.
y/5 x 3/7 = 27/35 :3
y/5 x 3/7 = 9/35
y/5 = 9/35 :3/7
y /5 = 3/5
y ;5 = 3:5
y:5 = 0,6
y = 0,6 x5
y = 3