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y : 15 - 34,87 = 52,21 + 6
y : 5 - 34,87 = 58,21
y : 15 = 58,21 + 34,87
y : 15 = 93,08
y = 93,08 × 15
y = 1396,2
\(y:15-34,87=52,21+6\)
\(=>y:15=58,21\)
\(=>y=58,21\times15\)
\(=>y=873,15\)
y : 15 - 34,87 = 52,21 + 6
y : 15 - 34,87 = 58,21
y : 15 = 58,21 + 34,87
y : 15 = 83,08
y = 83,08 x 15
y = 1246,2
\(7,75-\left(0,5\times y\div5-6,2\right)=5\)
\(0,5\times y\div5-6,2=7,75-5=2,75\)
\(0,5\div5\times y-6,2=2,75\)
\(0,1\times y=2,75+6,2=8,95\)
\(\dfrac{1}{10}y=8,95\)
\(y=8,95\times10=89,5\)
\(y\div6\times7,2+1,3\times y+y\div2+15=19,95\)
\(1,2\times y+1,3\times y+0,5y=19,95-15=4,95\)
\(y\left(1,2+1,3+0,5\right)=4,95\)
\(2y=4,95\)
\(y=4,95\div2=2,475\)
a) \(y\times15+y\times13=560\times45\)
\(y\times\left(15+13\right)=25200\)
\(y\times28=25200\)
\(y=25200:28\)
\(y=900\)
b) \(y\times345-y\times44-y=123600\)
\(y\times\left(345-44-1\right)=123600\)
\(y\times300=123600\)
\(y=123600:300\)
\(y=412\)
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) \(y+y\div0,5+y\div0,25+y\div0,125=15\)
\(\Leftrightarrow y+y\times2+y\times4+y\times8=15\)
\(\Leftrightarrow y\times\left(1+2+4+8\right)=15\)
\(\Leftrightarrow y\times15=15\)
\(\Leftrightarrow y=1\)
\(a.\)\(y-\frac{11}{3}=\frac{12}{5}\)
\(y=\frac{12}{5}+\frac{11}{3}\)
\(y=\frac{91}{15}\)
\(b.2-y=\frac{15}{6}\)
\(y=2-\frac{15}{6}\)
\(y=-\frac{1}{2}\)
\(c.y\times2\frac{2}{3}=\frac{4}{9}\)
\(y=\frac{4}{9}:2\frac{2}{3}\)
\(y=\frac{1}{6}\)
\(d.y:1\frac{2}{5}=\frac{21}{10}\)
\(y=\frac{21}{10}\times1\frac{2}{5}\)
\(y=\frac{147}{5}\)
198 - 42 : 6 x y + 15 = 200
198 - 7 x y = 200 - 15
198 - 7 x y = 185
7 x y = 198 - 185
7 x y = 13
y = 13 : 7
y = 13/7
Vậy y = 13/7
a)100-9:(372:3.y-1)-14=83
<=>100-9:(124y-1)-14=83
<=>86-9:(124y-1)=83
<=>9:(124y-1)=3
<=>124y-1=3
<=>124y=4
<=>y=\(\frac{1}{31}\approx0,3223\)
b)7260-120:24.y+924=528,3
<=>8184-5y=528,3
<=>5y=7655,7
<=>y=1531,14
c)2000-52:(615:3:y-15)-14=1984
<=>1986-52:(205:y-15)=1984
<=>52:(205:y-15)=2
<=>205:y-15=26
<=>205:y=41
<=>y=5
d)y+y.1/3+5/18=7/18
<=>4/3y=1/9
<=>y=1/12
e)13/15-(5/21+y)7/12=7/10
<=>7/12.(5/21+y)=1/6
<=>5/36+7/12y=1/6
<=>7/12y=1/36
<=>y=1/21\(\approx\)0,4762
h)y+2.y+3.y+...+10.y=49,5
<=>55y=49,5
<=>y=0,9
i)y.(1975/8.9+1885/9.10+1755/10.11+1579/11.12)=1/24
<=>7991,364899y=1/24
<=>y=33/6329161
tích nha mỏi tay quá
b) y + y : 0,5 + y : 0,25 + y : 0,125 = 15
yx1+yx2+yx4+yx8=15
yx(1+3+4+8)=15
yx15=15
y=15:15
y=1
\(y:15-34.87=52.21+6\)
\(y:15=1098+2958=4056\)
\(y=60840\)
. là nhân hay j hả bạn ?