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a, y x 8 = y + 10
=> 8y=y+10
=> 8y-y=10
=> 7y=10
=> y=10/7
b, y x 10 + 9 = y x 3 + 3
=> 10y+9=3y+3
=>10y+9-3y=3
=> 10y-3y+9=3
=> 10y-3y=3-9
=> 7y=-6
=> y=-6/7
:)
a/\(\dfrac{19}{20}-y=\dfrac{8}{5}-\dfrac{3}{4}\)
\(\dfrac{19}{20}-y=\dfrac{17}{20}\)
\(y=\dfrac{19}{20}-\dfrac{17}{20}\)
\(y=\dfrac{2}{20}=\dfrac{1}{10}\)
b/\(y:\dfrac{2}{3}=\dfrac{4}{9}\times3\)
\(y:\dfrac{2}{3}=\dfrac{4}{3}\)
\(y=\dfrac{4}{3}\times\dfrac{2}{3}\)
\(y=\dfrac{8}{9}\)
#データネ
a) 19/20 - y = 8/5 - 3/4
19/20 - y = 17/20
y = 17/20 + 19/20
y = 36/20
b) y : 2/3 = 4/9 x 3
y : 2/3 = 12/9
y = 12/9 x 2/3
y = 24/27
tích cho mik nhaaaaaaaaaaa
Câu 10:
\(a,y\times7+y\times3=70\\ \Rightarrow y\times\left(7+3\right)=70\\ \Rightarrow y\times10=70\\ \Rightarrow y=7\\ b,18:y+12:y=3\\ \Rightarrow\left(18+12\right):y=3\\ \Rightarrow30:y=3\\ \Rightarrow y=10\)
câu 11:
\(a,9\times365+2\times365-365=\left(9+2-1\right)\times365=10\times365=3650\\ b,108:9-18:9=\left(108-18\right):9=90:9=10\\ c,43\times95+4\times43+43=43\times\left(95+4+1\right)=43\times100=4300\)
\(y\times\dfrac{5}{7}=\dfrac{9}{17}\\ y=\dfrac{9}{17}:\dfrac{5}{7}\\ y=\dfrac{63}{85}\\ x:\dfrac{8}{9}=\dfrac{7}{10}\\ x=\dfrac{7}{10}\times\dfrac{8}{9}\\ x=\dfrac{28}{45}\)
\(\Leftrightarrow y\times\left(\dfrac{1}{7}+\dfrac{9}{21}+\dfrac{7}{3}\right)=\dfrac{5}{3}\)
\(\Leftrightarrow y\times\dfrac{61}{21}=\dfrac{5}{3}\)
\(\Leftrightarrow y=\dfrac{5}{3}:\dfrac{61}{21}=\dfrac{35}{61}\)
y x (1/7 +9/21 +7/3)= 5/3
y x 61/21 = 5/3
y = 5/3 : 61/21
y= 35/61
y x ( 8 + 2 ) = 420
y x 10 = 420
y = 420 : 10
y = 42
y x ( 109 - 9 ) = 2300
y x 100 = 2300
y = 23
y x 8 +y x2 = 420
yx(8+2)=420
y =420/(8+2)
y =420/10
y = 42
109 x y -9 x y = 2300
y x(109-9) =2300
y =2300/(109-9)
y =2300/100
y =23