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\(x+\frac{31}{10}=14,5+\frac{12}{10}\)
\(x+\frac{31}{10}=\frac{29}{2}+\frac{12}{10}\)
\(x+\frac{31}{10}=\frac{157}{10}\)
\(x=\frac{157}{10}-\frac{31}{10}\)
\(x=\frac{63}{5}\)
Học tốt #
\(x+\frac{31}{10}=14,5+\frac{12}{10}\)
\(\Rightarrow x+\frac{31}{10}=\frac{157}{10}\)
\(\Rightarrow x=\frac{157}{10}-\frac{31}{10}\)
\(\Rightarrow x=\frac{63}{5}\)
Vậy \(x=\frac{63}{5}\)
_Chúc bạn học tốt_
a)Ta có :
x-8,7=5 x 1,2 = 6
=> x = 6+8,7 = 14,7
Vậy x=14,7
b) Ta có
x+31/10=14,5+12/10=15,7
=> x=15,7-31/10=12,6.
Vậy x=12,6
a) ( x - 8,7 ) = 5 * 1,2
x - 8,7 = 6
x = 6 + 8,7
x = 14,7
b) x + 31/10 = 14,5 +12/10
\(x+\frac{31}{10}=x+\frac{12}{10}+\frac{19}{10}=14,5+\frac{12}{10}\)
\(x+\frac{19}{10}=14,5\)
\(x+1,9=14,5\)
\(x=14,5-1,9=12,6\)
x+\(\frac{31}{10}\)=\(\frac{157}{10}\)
x=\(\frac{157}{10}-\frac{31}{10}\)
x=\(\frac{63}{5}\)
tính trừ bt nha bạn vế thương thì cũng tĩnh ra xong mới tính nha
a, \(x\) + \(\dfrac{1}{4}\) - \(\dfrac{3}{8}\) = \(\dfrac{7}{12}\)
\(x\) - \(\dfrac{1}{8}\) = \(\dfrac{7}{12}\)
\(x\) = \(\dfrac{7}{12}\) + \(\dfrac{1}{8}\)
\(x\) = \(\dfrac{17}{24}\)
a ) 10 x X - 1 - 3 - 5 - 7 - ... - 19 = 2 + 4 + 6 + ... + 20
10 x X - 1 - 3 - 5 - 7 - ... - 19 = 110
10 x X - ( 1 + 3 + 5 + 7 + ... + 19 ) = 110
10 x X - 100 = 110
10 x X = 110 + 100
10 x X = 210
X = 210 : 10
X = 21
Lời giải:
a.
$x-\frac{1}{2}=\frac{2}{3}$
$x=\frac{2}{3}+\frac{1}{2}=\frac{7}{6}$
b.
$x\times \frac{5}{6}=\frac{1}{2}$
$x=\frac{1}{2}: \frac{5}{6}=\frac{3}{5}$
c.
$x:\frac{2}{5}=10$
$x=10\times \frac{2}{5}=4$
d.
$\frac{7}{5}-x=\frac{12}{10}$
$x=\frac{7}{5}-\frac{12}{10}=\frac{1}{5}$
1. a
\(\dfrac{8}{5}-\dfrac{5}{6}\cdot\dfrac{3}{4}\)
\(=\dfrac{8}{5}-\dfrac{5\cdot3}{3\cdot2\cdot4}\)
\(=\dfrac{8}{5}-\dfrac{5}{8}=\dfrac{39}{40}\)
1.b
\(=\dfrac{7}{8}+\dfrac{5}{6}\cdot\dfrac{3}{2}\)
\(=\dfrac{7}{8}+\dfrac{5\cdot3}{3\cdot2\cdot2}\)
\(=\dfrac{7}{8}+\dfrac{5}{4}=\dfrac{17}{8}\)
2.a
\(\dfrac{4}{5}+x=\dfrac{11}{10}\)
\(x=\dfrac{11}{10}-\dfrac{4}{5}=\dfrac{3}{10}\)
2.b
\(x-\dfrac{3}{4}=\dfrac{5}{7}\)
\(x=\dfrac{5}{7}+\dfrac{3}{4}=\dfrac{41}{28}\)
\(x\) \(\times\) \(\dfrac{4}{5}\) = 15
\(x\) = 15 : \(\dfrac{4}{5}\)
\(x\) = \(\dfrac{75}{4}\)
\(\dfrac{12}{25}\) \(\times\) \(x\) = \(\dfrac{4}{10}\)
\(x\) = \(\dfrac{4}{10}\) : \(\dfrac{12}{25}\)
\(x\) = \(\dfrac{5}{6}\)
A, 11/12
B, 12,6
a,
x- 7/12 = 1/3
x = 1/3 + 7/12
x = 11/12
b,
x + 31/10 = 14,5
x = 14,5 - 31/10
x = 57/5