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X – 60 : 15 = 20,5
=> X – 60 = 307,5
=> X = 367,5
X : 4 + 12 = 23
=> X : 4 = 11
=> X = 44
( x – 60 ) : 15 = 20
=> x – 60 = 300
=> x = 360
3 .(x + 7)- 15= 27
=> 3 .(x + 7) = 42
=> x + 7 = 14
=> x = 7
2. ( x – 5 )- 17 = 24 + 6 x 1,5
=> 2. ( x – 5 ) - 17 = 33
=> 2. ( x – 5 ) = 50
=> x - 5 = 25
=> x = 30
\(a,x-60:15=20,5\)
\(x-4=20,5\)
\(x=20,5+4=24,5\)
\(b,x:4+12=23\)
\(x:4=23-12=11\)
\(x=11.4=44\)
\(c,\)\(\left(x-60\right)\)\(:15=20\)
\(x-60=20.15=300\)
\(x=300+60=360\)
\(d,3\left(x+7\right)\)\(-15=27\)
\(3\left(x+7\right)\)\(=27+15=42\)
\(x+7=42:3=14\)
\(x=14-7=7\)
\(e,2\left(x-5\right)\)\(-17=24+6.1,5=24+9=33\)
\(2\left(x-5\right)\)\(=33+17=50\)
\(x-5=50:2=25\)
\(x=25+5=30\)
=>........................
b: Ta có: \(\dfrac{12}{5}:x+\dfrac{4}{3}=3+\dfrac{2}{3}\)
\(\Leftrightarrow\dfrac{12}{5}:x=3-\dfrac{2}{3}=\dfrac{7}{3}\)
hay \(x=\dfrac{12}{5}:\dfrac{7}{3}=\dfrac{36}{35}\)
7 giờ 571,11 2 .X:5 -8,6 =0,4 X =(0,4+8,6) x5 X =45
a, 7\(\dfrac{3}{5}\) : \(x\) = 5\(\dfrac{4}{15}\) - 1\(\dfrac{1}{6}\)
\(\dfrac{38}{5}\) : \(x\) = \(\dfrac{79}{15}\) - \(\dfrac{7}{6}\)
\(x\) = \(\dfrac{41}{10}\)
\(x\) = \(\dfrac{38}{5}\) : \(\dfrac{41}{10}\)
\(x\) = \(\dfrac{76}{41}\)
b, \(x\) \(\times\) 2\(\dfrac{2}{3}\) = 3\(\dfrac{4}{8}\) + 6\(\dfrac{5}{12}\)
\(x\) \(\times\) \(\dfrac{8}{3}\) = \(\dfrac{7}{2}\) + \(\dfrac{77}{12}\)
\(x\) \(\times\) \(\dfrac{8}{3}\) = \(\dfrac{119}{12}\)
\(x\) = \(\dfrac{119}{12}\)
\(x\) = \(\dfrac{119}{12}\): \(\dfrac{8}{3}\)
\(x\) = \(\dfrac{119}{32}\)
a) \(\frac{37-2\times\left(y-3,25\right)}{5}=7,06\)
=> \(37-2\times\left(y-3,25\right)=7,06\times5\)
=> \(37-2\times\left(y-3,25\right)=35,3\)
=> \(2\times\left(y-3,25\right)=37-35,3=1,7\)
=> \(y-3,25=1,7:2=0,85\)
=> y = 0,85 + 3,25 = 4,1
Tới khúc này là dẫn đến tìm x chứ không tìm y nx ...
Sửa câu b lại đi
c) \(\frac{5}{12}\times\left(8+x\right)-\frac{1}{5}\times\left(\frac{15}{4}+x\right)=15\)
=> \(\frac{10}{3}+\frac{5}{12}x-\frac{3}{4}+\frac{1}{5}x=15\)
=> \(\left(\frac{10}{3}-\frac{3}{4}\right)-\left(\frac{5}{12}x-\frac{1}{5}x\right)=15\)
=> \(\frac{31}{12}+\frac{13}{60}x=15\)
=> \(\frac{13}{60}x=15-\frac{31}{12}=\frac{149}{12}\)
=> \(x=\frac{149}{12}:\frac{13}{60}=\frac{149}{12}\cdot\frac{60}{13}=\frac{745}{13}\)
Làm nốt câu d nhé
ta se tinh nhu sau :
x : ( 8 + 3 - 10 ) * ( 32 + 18 - 10 ) = 120
x :1 * 40 = 120
x = 120 : 40 * 1
x = 30
mih hoc lop bon , neu sai thi gop y cho mih nha !! :))
a,12,5-x=4,27
x=12,5-4,27
x=8,23
vay x=8,23
b,18,2:x=5,6
x=18,2:5,6
x=3,25
vay x=3,25