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a; 100% : \(x\) - 50% : \(x\) + 40% : \(x\) = 18 + 30% : \(x\)
(100% - 50% + 40%): \(x\) = 18 + 30% : \(x\)
90% : \(x\) = 18 + 30% : \(x\)
90%: \(x\) - 30%: \(x\) = 18
60% : \(x\) = 18
\(x\) = 60% : 18
\(x\) = \(\dfrac{1}{30}\)
\(y+y.\frac{1}{3}.\frac{9}{2}+y.\frac{7}{2}=25\)
\(y+y.6+y.\frac{7}{2}=25\)
\(y.\left(1+6+\frac{7}{2}\right)=25\)
\(y.\frac{21}{2}=25\)
\(y=25:\frac{21}{2}\)
\(y=25.\frac{2}{21}\)
\(y=\frac{50}{21}\)
\(y.5+y.3+y+y=50\)
\(y.\left(5+3+1+1\right)=50\)
\(y.10=50\)
\(y=5\)
\(\frac{1}{5}\)+ \(\frac{3}{5}y\)=\(\frac{24}{25}\)
suy ra 3/5y =24/25-1/5
suy ra 3/5y =19/25
suy ra y = 19/25:3/5
suy ra y = 19/15
11/3+11/5.y-4/5=24/5
88/15.y=24/5-4/5
88/15.y=20/5
88/15.y=4
y=4:88/15
y=15/22
11/3 + 11/5 x y - 4/5 = 24/5
11/3 + 11/5 x y = 24/5 + 4/5
11/3 + 11/5 x y = 28/5
11/5 x y = 28/5 - 11/3
11/5 x y = 29/15
y = 29/15 : 11/5
y = 29/33
có \(\frac{24}{y}:\frac{8}{3}=\frac{3}{5}\)
=> \(\frac{24}{y}.\frac{3}{8}=\frac{3}{5}\)
=> 24.3.5= 8.y.3
=> y=15
a)\(\frac{45,2}{Y}+\frac{57,8}{Y}-\frac{71,8}{Y}\)=4,8
\(\frac{\left(45,2+57,8\right)-71,8}{Y}\)=4,8
=\(\frac{103-71,8}{Y}=4,8\)
\(\frac{31,2}{Y}=4,8\)
Y=\(\frac{31,2}{4,8}\)
Y=6,5.
b)107,8-\(\frac{Y}{9,5}\)=29,2
\(\frac{Y}{9,5}\)=107,8-29,2
\(\frac{Y}{9,5}\)=78,6
Y=78,6 x 9,5
Y=746,7
Bt2
a)175,84 x 3 -173,4+175,84 x 7 -62,6
=175,84 x (3+7) - (173,4+62,6)
=175,84 x 10 -236
=1758,4-236
=1522,4
b)521,12 x 5 -42,14 x 50+521,12 x 5 -42,14 x 50
=2(521,12 x 5 -42,14 x 50)
= 2 x (5 x (521,12 -42,14 x 10))
=2 x (5 x 99,72)
=2 x 498,6
=997,2.
Cho xin nhá :))
Ta có: \(\frac{24+y}{50}+y=\frac{3}{5}\)
\(\Rightarrow\frac{24+y}{50}+\frac{50y}{50}=\frac{30}{50}\)
\(\Rightarrow24+51y=30\)
\(\Rightarrow51y=30-24\)
\(\Rightarrow y=\frac{6}{51}\)
bạn sai rùi