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tìm y
a)y 56 b) 15 5
__ = __ __ = __
7 49 27 y
\(a,\Rightarrow7y=56\Leftrightarrow y=8\)
b, \(\Rightarrow3y=27\Leftrightarrow y=9\)
a) y.49 = 56.7
y.49=392
y=392:49
y=8
b)15.y=27.5
15.y= 135
y=135:15
y=9
(tick nhé)
a,\(\frac{y}{7}\)=\(\frac{56:7}{49:7}\)
\(\Rightarrow\frac{y}{7}\)=\(\frac{8}{7}\)
\(\Rightarrow y=8\)
Vậy y=8
b,\(\frac{15}{27}=\frac{5}{y}\)
\(\Rightarrow\frac{15:3}{27:3}=\frac{5}{y}\)
\(\Rightarrow\frac{5}{9}=\frac{5}{y}\)
\(\Rightarrow y=9\)
Vậy y=9
a) \(y\times27+y\times30+y\times43=210500\)
\(y\times\left(27+30+43\right)=210500\)
\(y\times100=210500\)
\(y=210500\div100\)
\(y=2105\)
b) \(15\times y+85\times y=300\)
\(y\times\left(15+85\right)=300\)
\(y\times100=300\)
\(y=300\div100\)
\(y=3\)
\(a,y\times27+y\times30+y\times43=210500\)
\(\Rightarrow y\times\left(27+30+43\right)=210500\)
\(\Rightarrow y\times100=210500\)
\(\Rightarrow y=210500:100=2105\)
\(b,15\times y+85\times y=300\)
\(\Rightarrow y\times\left(15+85\right)=300\)
\(\Rightarrow y\times100=300\)
\(\Rightarrow y=300:100=3\)
a) y : 4/11 x 3/5 = 27/4
y : 4/11 = 27/4 : 3/5
y : 4/11 = 45/4
y = 45/4 x 4/11
y = 45/11
b) y + 7/2 - 5/9 = 14/3
y + 7/2 = 14/3 + 5/9
y + 7/2 = 47/9
y = 47/9 - 7/2
y = 31/18
a) y : 4/11 x 3/5 = 27/4
y : 4/11 = 27/4 : 3/5
y : 4/11 = 45/4
y = 45/4 x 4/11
y = 45/11
b) y + 7/2 - 5/9 = 14/3
y + 7/2 = 14/3 + 5/9
y + 7/2 = 47/9
y = 47/9 - 7/2
y = 31/18
\(\dfrac{120}{150}+\dfrac{15}{27}=\dfrac{4}{5}+\dfrac{5}{9}=\dfrac{36}{45}+\dfrac{25}{45}=\dfrac{61}{45}\)
b
\(\dfrac{42}{49}+\dfrac{56}{84}=\dfrac{6}{7}+\dfrac{14}{21}=\dfrac{18}{21}+\dfrac{14}{21}=\dfrac{32}{21}\)
150/120 + 15/27
= 5/3 + 5/9
= 20/9
42/49 + 56/84
= 6/7 + 2/3
= 32/21
Rút gọn: \(\frac{56}{49}=\frac{8}{7}\)
\(\frac{y}{7}=\frac{8}{7}\Rightarrow y=8\)
Rút gọn: \(\frac{15}{27}=\frac{5}{9}\)
\(\frac{5}{9}=\frac{5}{y}\Rightarrow y=9\)
a) y/7=56/49=> 7.56=y.49
=> y=7.56:49
=>y=8 vậy y=8
b)15/49=5/y
=> 15y=27.5
=> y=27.5:15
=>y=9 vậy y=9