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a ) y : 0.5 + y x 3 = 2,3
y x 2 + y x 3 = 2,3
y x ( 2 + 3 ) = 2,3
y x 5 = 2,3
y =0,46
b ) y : 0 , 25 - y : 2,5 = 0,18
y x 4 - y x \(\frac{2}{5}\) = 0,18
y x ( 4 - \(\frac{2}{5}\)) = 0 , 18
y x 3,6 = 0 , 18
y =0,05
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0,5 x y + 1,4 x y = 106,78
1,9 x y = 106,78
y = 106,78 : 1,9
y = 56,2
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\(y:0,5+y\times0,5=0,75\)
\(y:\frac{5}{10}+y\times0,5=0,75\)
\(y\times\frac{10}{5}+y\times0,5=0,75\)
\(y\times2+y\times0,5=0,75\)
\(y\times\left(2+05\right)=0,75\)
\(y\times2,5=0,75\)
\(y=0,75:2,5\)
\(y=0,3\)
vậy \(y=0,3\)
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y:0,2 + y:0,5 + y\(\times\) 3 = 89,6
y \(\times\) 5 + y \(\times\) 2 + y \(\times\) 3 = 89,6
y \(\times\) (5 + 2 + 3) = 89,6
y \(\times\) 10 = 89,6
y = 89,6 : 10
y = 8,96
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\(7,75-\left(0,5\times y\div5-6,2\right)=5\)
\(0,5\times y\div5-6,2=7,75-5=2,75\)
\(0,5\div5\times y-6,2=2,75\)
\(0,1\times y=2,75+6,2=8,95\)
\(\dfrac{1}{10}y=8,95\)
\(y=8,95\times10=89,5\)
\(y\div6\times7,2+1,3\times y+y\div2+15=19,95\)
\(1,2\times y+1,3\times y+0,5y=19,95-15=4,95\)
\(y\left(1,2+1,3+0,5\right)=4,95\)
\(2y=4,95\)
\(y=4,95\div2=2,475\)
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y x 6 + y x 3 + y = 80
y x 6 + y x 3 + y x 1 = 80
y x (6+3+1)=80
y x 10 =80
y =80:10
y =8
a) \(y\times6+y\times3+y=80\)
\(\Leftrightarrow y\times\left(6+3+1\right)=80\)
\(\Leftrightarrow y\times10=80\)
\(\Leftrightarrow y=80\div10\)
\(\Leftrightarrow y=8\)
b) \(y+y\div0,5+y\div0,25+y\div0,125=15\)
\(\Leftrightarrow y+y\times2+y\times4+y\times8=15\)
\(\Leftrightarrow y\times\left(1+2+4+8\right)=15\)
\(\Leftrightarrow y\times15=15\)
\(\Leftrightarrow y=1\)
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