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1-\(\left(3\frac{3}{8}+x-2\frac{5}{24}\right)\)\(.\frac{12}{17}=0\)
\(\Rightarrow\left(3\frac{3}{8}+x-2\frac{5}{24}\right)\)\(.\frac{12}{17}\)\(=1\)
\(\frac{27}{8}+x-\frac{53}{24}\) \(=1:\frac{12}{17}\)
\(\frac{27}{8}+x=\frac{17}{12}+\frac{53}{24}\)
\(\frac{27}{8}+x=\frac{34+53}{24}\)
\(\frac{27}{8}+x=\frac{87}{24}\)
\(x=\frac{87}{24}-\frac{27}{8}\)
\(x=\frac{87-81}{24}\)
\(x=\frac{6}{24}=\frac{1}{4}\)
a,
x.2/7.3/4=5/21
x.3/14=5/21
x=5/21:3/14
x=10/9
b,
x.1/2=1/3
x=1/3:1/2
x=2/3
c,
x:4/5=25/8:5/4
x:4/5=5/2
x=5/2.4/5=2
A, x= 5/25 : 3/4 : 2/7 = 14/15
B, x=1/3 : 1/2 = 2/3
C, x=(25/8 : 5/4)x4/5 = 5/2 x 4/5 = 2
a) \(x\cdot\frac{1}{2}+x\cdot\frac{1}{4}+x\cdot\frac{1}{8}=\frac{21}{24}\)
\(x\cdot\left(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}\right)=\frac{7}{8}\)
\(x\cdot\frac{7}{8}=\frac{7}{8}\)
\(\Rightarrow x=\frac{7}{8}\div\frac{7}{8}=1\)
b) \(\left(x+4\right)+\left(x+9\right)+\left(x+14\right)+.....+\left(x+44\right)+\left(x+49\right)=1430\)
\(\left(x+x+x+....+x+x\right)+\left(4+9+14+...+44+49\right)=1430\)
\(10x+265=1430\)
\(10x=1430-265\)
\(10x=1165\)
\(\Rightarrow x=\frac{1165}{10}=116,5\)
c) \(x\cdot0,25-0,5=1\)
\(x\cdot0,25=1+0,5\)
\(x\cdot0,25=1,5\)
\(\Rightarrow x=1,5\div0,25=6\)
Trả lời:
\(\frac{2}{24}\cdot x=1\frac{5}{7}+46\frac{2}{6}\)
\(\frac{1}{12}\cdot x=\frac{12}{7}+\frac{139}{3}\)
\(\frac{1}{12}\cdot x=\frac{1009}{21}\)
\(x=\frac{1009}{21}:\frac{1}{12}\)
\(x=\frac{4036}{7}\)
Hc tốt #
\(\frac{2}{24}\cdot x=1\frac{5}{7}+46\frac{2}{6}\)
\(\frac{1}{12}\cdot x=\frac{12}{7}+\frac{139}{3}\)
\(\frac{1}{12}\cdot x=\frac{1009}{21}\)
\(x=\frac{1009}{21}:\frac{1}{12}\)
\(x=\frac{4036}{7}\)
\(\left(4.5-2\cdot x\right):\frac{3}{4}=1\frac{1}{3}\)
\(\left(4.5-2x\right):\frac{3}{4}=\frac{4}{3}\)
\(\left(4.5-2x\right)=\frac{4}{3}\cdot\frac{3}{4}\)
\(4.5-2x=1\)
\(2x=4.5-1\)
\(2x=3.5\)
\(x=3.5:2\)
\(x=1.75\)
(4,5 - 2 x X) : 3/4 = 1 1/3
(4,5 - 2 x X) = 1 1/3 x 3/4
(4,5 - 2 x X) = 1
2 x X = 4,5 - 1
2 x X = 3,5
X = 3,5 : 2
X = 1,75
chúc bạn học giỏi ^_^
tk mk nha !!!
\(\frac{2.x}{5}=\frac{24}{2}\)
\(\frac{2.x}{5}=12\)
\(\left(2.x\right):5=12\)
\(2.x=12.5\)
\(2.x=60\)
\(x=60:2\)
\(x=30\)
\(\frac{2\cdot x}{5}=\frac{24}{2}=12=\frac{60}{5}\)
=> 2*x = 60
x = 30