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3/2 x 4/5 - x = 2/3
6/5 - x = 2/3
x = 6/5 - 2/3
x = 8/15
=> x = 8/15
Bài làm
\(\frac{3}{2}x\frac{4}{5}-X=\frac{2}{3}\)
\(\frac{6}{5}-X=\frac{2}{3}\)
\(X=\frac{6}{5}-\frac{2}{3}\)
\(X=\frac{18}{15}-\frac{10}{15}\)
\(X=\frac{8}{15}\)
# Chúc bạn học tốt #
a) \(92.4-27=\frac{x+350}{x}+315\)
\(368-27=1+\frac{350}{x}+315\)
\(341=\frac{350}{x}+316\)
\(341-316=\frac{350}{x}\)
\(25=\frac{350}{x}\)
\(25x=350\)
\(x=14\)
b) \(\left(\frac{3}{2}-x\right).\frac{1}{3}-\frac{2}{3}.\left(\frac{1}{2}-x\right)=\frac{1}{3}\)
\(\frac{\frac{3}{2}}{3}-\frac{x}{3}-\frac{2}{3}.\left(\frac{1}{2}-x\right)=\frac{1}{3}\)
\(\frac{1}{2}-\frac{x}{2}-\frac{2}{3}.\left(\frac{1}{2}-x\right)=\frac{1}{3}\)
\(\frac{3}{2}-x-2.\left(\frac{1}{2}-x\right)=1\)
\(\frac{3}{2}-x-1+2x=1\)
\(\frac{1}{2}+x=1\)
\(x=1-\frac{1}{2}\)
\(x=\frac{1}{2}\)
Trả lời
b)X.3 1/3=3 1/3
X =3 1/3 : 3 1/3
X =1
c)5 2/3: X=3 2/3-2 1/2
17/3 : X=11/3-5/2
17/3: X =17/6
X =17/3:17/6
X =2
\(b;x\times3\frac{1}{3}=3\frac{1}{3}\Leftrightarrow x=\frac{3\frac{1}{3}}{3\frac{1}{3}}=1\)
\(c;5\frac{2}{3}:x=3\frac{2}{3}-2\frac{1}{2}=1\frac{1}{6}\Leftrightarrow5\frac{2}{3}:1\frac{1}{6}=\frac{17}{3}\times\frac{6}{7}=\frac{34}{7}\)
a) x + 1/15 = 1/3 - 1/4 = 4/12 - 3/12 = 1/12.
=> x = 1/12 - 1/15 = 5/60 - 4/60 = 1/60.
b) x - 5/12 = 1/3 + 1/4 = 4/12 + 3/12 = 7/12.
=> x = 7/12 + 5/12 = 1
c) x x 2/7 = 3/4 x 4/15 = 1/5
=> x = 1/5 : 2/7 = 1/5 x 7/2 = 7/10
d) x : 3/8 = 4/3 : 3/6 = 4/3 x 2 = 8/3
=> x = 8/3 x 3/8 = 1
\(A=\)\(\frac{9}{1}+\frac{8}{2}+\frac{7}{3}+...+\frac{1}{9}\)
\(A=\left(\frac{9}{1}-8\right)+\left(\frac{8}{2}+1\right)+\left(\frac{7}{3}+1\right)+...+\left(\frac{1}{9}+1\right)\)
\(A=1+\frac{10}{2}+\frac{10}{3}+...+\frac{10}{9}\)
\(A=\frac{10}{10}+\frac{10}{2}+\frac{10}{3}+...+\frac{10}{9}\)
\(A=10\left(\frac{1}{2}+\frac{1}{3}+...+\frac{1}{9}+\frac{1}{10}\right)>\frac{1}{2}+\frac{1}{3}+...+\frac{1}{10}=B\)
\(\Rightarrow A:B=\frac{10\left(\frac{1}{2}+\frac{1}{3}+...+\frac{1}{10}\right)}{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{10}}\)\(=10\)
Vậy \(A:B=10\)
a) \(x+2\frac{1}{6}=3\frac{1}{3}\)
\(x+\frac{13}{6}=\frac{10}{3}\)
\(x=\frac{10}{3}-\frac{13}{6}=\frac{7}{6}\)
b) \(x-2\frac{3}{7}=3\)
\(x-\frac{17}{7}=3\)
\(x=3+\frac{17}{7}=\frac{38}{7}\)
c) \(x.1\frac{1}{3}=2\frac{2}{3}\)(dấu chấm là dấu nhân)
\(x.\frac{4}{3}=\frac{8}{3}\)
\(x=\frac{8}{3}:\frac{4}{3}=2\)
(Nhớ k cho mình với nhé!)
Bài làm
\(X\frac{31}{3}=\frac{31}{3}\)
\(X=\frac{31}{3}:\frac{31}{3}\)
\(X=\frac{31}{3}x\frac{3}{31}\)
\(X=1\)
# Chúc bạn học tốt #
bạn ơi đây là hỗn số