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a) y - 32,15 x 6 = 54,76
=> y - 192,9 = 54,76
y = 54,76 + 192,9
y = 247,66
b) 245,716 - y x 12 = 76,54
=> y x 12 = 245,716 - 76,54
y x 12 = 169,176
=> y = 169,176 : 12
y = 14,098
t i c k nhé!! 343576567687879
a, y - 32,15 x 6 = 54,76
y - 192,9 = 54,76
y = 54,76 + 192,9
y = 247,66
Vậy y = 247,66
b, 245,716 - y x 12 = 76,54
y x 12 = 245,716 - 76,54
y x 12 = 169,176
y = 169,176 : 12
y = 14,098
Vậy y = 14,098
245,716- y*12=76,54
y*12=245,716-76,54
y*12= 169,176
y = 169,176:12
y = 14,098
y X 12 = 245,716 - 76,54
y X 12 = 169,176
y= 169,176 : 12
y= 84,588
\(a.\)\(y-\frac{11}{3}=\frac{12}{5}\)
\(y=\frac{12}{5}+\frac{11}{3}\)
\(y=\frac{91}{15}\)
\(b.2-y=\frac{15}{6}\)
\(y=2-\frac{15}{6}\)
\(y=-\frac{1}{2}\)
\(c.y\times2\frac{2}{3}=\frac{4}{9}\)
\(y=\frac{4}{9}:2\frac{2}{3}\)
\(y=\frac{1}{6}\)
\(d.y:1\frac{2}{5}=\frac{21}{10}\)
\(y=\frac{21}{10}\times1\frac{2}{5}\)
\(y=\frac{147}{5}\)
a/
\(\dfrac{1}{x}+\dfrac{1}{y}=\dfrac{1}{2}+\dfrac{1}{3}=\dfrac{5}{6}\)
=> x=2; y=3 hoặc x=3; y=2
b
\(\dfrac{1}{x}+\dfrac{1}{y}=\dfrac{1}{3}+\dfrac{1}{4}=\dfrac{7}{12}\)
=> x=3; y=4 hoặc x=4; y=3
\(a,\left(x;y\right)=\left(2;3\right)hoặc\left(x;y\right)=\left(3;2\right)\\ b,\left(x;y\right)=\left(2;6\right)hoặc\left(x;y\right)=\left(6;2\right)hoặc\left(x;y\right)=\left(3;4\right)hoặc\left(x;y\right)=\left(4;3\right)\)
a) y+2,3=15,724
=>y =15,724 - 2,3
=>y = 13,424
b) 127-(y-15)=86
=> y-15 = 127-86
=> y-15 = 41
=> y = 41+15
=> y = 56
c) 2 x (y-12)+18 = 164
=> 2 x (y-12) = 146
=> y-12 = 73
=> y = 73 + 12
=> y = 85
a) \(y+2,3=15,724\)
\(y=15,724-2,3\)
\(y=13,424\)
b) \(127-\left(y-15\right)=86\)
\(y-15=127-86\)
\(y-15=41\)
\(y=41+15\)
\(y=56\)
c) \(2\cdot\left(x-12\right)+18=164\)
\(2\cdot\left(x-12\right)=164-18\)
\(2\cdot\left(x-12\right)=146\)
\(x-12=146:2\)
\(x-12=73\)
\(x=73+12\)
\(x=85\)
\(\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+...+\frac{1}{y.\left(y+1\right)}=\frac{2019}{2020}\)
\(\Rightarrow\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{y.\left(y+1\right)}=\frac{2019}{2020}\)
\(\Rightarrow1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+..+\frac{1}{y}-\frac{1}{y+1}=\frac{2019}{2020}\)
\(\Rightarrow1-\frac{1}{y+1}=\frac{2019}{2020}\)
\(\Rightarrow\frac{1}{y+1}=1-\frac{2019}{2020}\)
\(\Rightarrow\frac{1}{y+1}=\frac{1}{2020}\)
\(\Rightarrow y+1=2020\)
\(\Rightarrow y=2020-1\)
\(\Rightarrow y=2019\)
Vậy y = 2019
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
a] y - 32,15 . 6 = 54,76 b] 245,716 - y . 12 = 76,54
y - 192,9 = 54,6 y . 12 = 245,716- 76,54
y = 54,6 + 192,9 [ TSBT ] y . 12 = 169,176
y = 247,5 y = 169,176 : 12 [ TTS ]
y = 14,098
~ Chúc bạn học tốt ~
a, \(y-32,15\times6=54,76\)
\(\Leftrightarrow y-192.9=54,76\)
\(\Leftrightarrow y=54,76+192,9\)
\(\Leftrightarrow\)\(y=247.66\)
Vậy ...
b, \(245,716-y\times12=76,54\)
\(\Leftrightarrow y\times12=245,716-76,54\)
\(\Leftrightarrow y\times12=169,176\)
\(\Leftrightarrow y=169,176\div12\)
\(\Leftrightarrow y=14,098\)
Vậy ...