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`@` `\text {Ans}`
`\downarrow`
`a)`
\(\dfrac{3}{2}\times\dfrac{4}{5}-x=\dfrac{2}{3}\)
\(\dfrac{6}{5}-x=\dfrac{2}{3}\)
\(x=\dfrac{6}{5}-\dfrac{2}{3}\)
\(x=\dfrac{18}{15}-\dfrac{10}{15}\)
\(x=\dfrac{8}{15}\)
Vậy, `x =`\(\dfrac{8}{15}\)
`b)`
\(x\times3\dfrac{1}{3}=3\dfrac{1}{3}\div4\dfrac{1}{4}\)
\(x\times\dfrac{10}{3}=\dfrac{40}{51}\)
\(x=\dfrac{40}{51}\div\dfrac{10}{3}\)
\(x=\dfrac{4}{17}\)
Vậy, \(x=\dfrac{4}{17}\)
`c)`
\(5\dfrac{2}{3}\div x=3\dfrac{2}{3}-2\dfrac{1}{2}\)
\(\dfrac{17}{3}\div x=\dfrac{7}{6}\)
\(x=\dfrac{17}{3}\div\dfrac{7}{6}\)
\(x=\dfrac{34}{7}\)
Vậy, `x = `\(\dfrac{34}{7}\)
a) \(\dfrac{3}{2}x\dfrac{4}{5}-x=\dfrac{2}{3}\Rightarrow\dfrac{6}{5}-x=\dfrac{2}{3}\Rightarrow x=\dfrac{6}{5}-\dfrac{2}{3}=\dfrac{18}{15}-\dfrac{10}{15}=\dfrac{8}{15}\)
b) \(x.3\dfrac{1}{3}=3\dfrac{1}{3}:4\dfrac{1}{4}\Rightarrow\dfrac{10}{3}.x=\dfrac{10}{3}:\dfrac{17}{4}\Rightarrow\dfrac{10}{3}.x=\dfrac{10}{3}.\dfrac{4}{17}\Rightarrow x=\dfrac{10}{3}.\dfrac{4}{17}:\dfrac{10}{3}=\dfrac{10}{3}.\dfrac{4}{17}.\dfrac{3}{10}=\dfrac{4}{17}\)
c) \(5\dfrac{2}{3}:x=3\dfrac{2}{3}-2\dfrac{1}{2}\Rightarrow\dfrac{17}{3}:x=\dfrac{11}{3}-\dfrac{5}{2}\Rightarrow\dfrac{17}{3}:x=\dfrac{22}{6}-\dfrac{15}{6}\Rightarrow\dfrac{17}{3}:x=\dfrac{7}{6}\Rightarrow x=\dfrac{17}{3}:\dfrac{7}{6}=\dfrac{17}{3}.\dfrac{7}{6}=\dfrac{119}{18}\)
\(x+\frac{x}{3}+\frac{x}{2}+\frac{3}{4}=\frac{5}{3}\)
\(\Rightarrow x+\frac{x}{3}+\frac{x}{2}=\frac{5}{3}-\frac{3}{4}=\frac{11}{12}\)
\(\Rightarrow x\left(1+\frac{1}{3}+\frac{1}{2}\right)=\frac{11}{12}\)
\(\Rightarrow x.\frac{11}{6}=\frac{11}{12}\)
\(\Rightarrow x=\frac{11}{12}:\frac{11}{6}=\frac{11}{12}.\frac{6}{11}\)
\(\Rightarrow x=\frac{1}{2}\)
x + \(\frac{x}{3}\)+\(\frac{x}{2}\)+ \(\frac{3}{4}\)=\(\frac{5}{3}\)
x*1+ x*\(\frac{1}{3}\)+x*\(\frac{1}{2}\) = \(\frac{5}{3}-\frac{3}{4}\)
x *( 1+\(\frac{1}{3}\)+\(\frac{1}{2}\)) = \(\frac{11}{12}\)
x* \(\frac{11}{6}\) = \(\frac{11}{12}\)
x = \(\frac{11}{12}:\frac{11}{6}\)
x = \(\frac{1}{2}\)
Vậy \(x=\frac{1}{2}\)
2*(x+3)+3*(x+4)+4*(x+5)-8*x=93
2*x+2*3+3*x+3*4+4*x+4*5-8*x =93
(2*x+3*x+4*x-8*x)+(2*3+3*4+4*5)=93
x*(2+3+4-8)+(6+12+20) =93
x*1+38 =93
x =93-38
x =55
a) x × 7/9 = 2/3 + 2 1/2
x × 7/9 = 2/3 + 5/2
x × 7/9 = 19/6
x = 19/6 : 7/9
x = 57/14
b) 5/7 + x : 9/4 = 4/3
x : 9/4 = 4/3 - 5/7
x : 9/4 = 13/21
x = 13/21 × 9/4
x = 39/28
Một tốp thợ có 120 người dự địnhnlamf trong 50 ngày . Khi bắt đầu làm có một số người đến làm thêm nên làm xong công việc đó trong 30 ngày . Hỏi có bao nhiêu người đến thêm?
\(\frac{4}{3}+x.\frac{2}{3}-\frac{1}{4}=\frac{53}{12}\)
\(\frac{4}{3}+x.\frac{2}{3}=\frac{53}{12}+\frac{1}{4}\)
\(\frac{4}{3}+x.\frac{2}{3}=\frac{14}{3}\)
\(x.\frac{2}{3}=\frac{14}{3}-\frac{4}{3}\)
\(x.\frac{2}{3}=\frac{10}{3}\)
\(x=\frac{10}{3}:\frac{2}{3}\)
\(x=\frac{10}{3}.\frac{3}{2}\)
\(x=5\)
chuẩn luôn , tích mk nha
\(\frac{4}{3}+\frac{2}{3}x-\frac{1}{4}=\frac{53}{12}\)
\(\Rightarrow\frac{4}{3}+\frac{2}{3}x=\frac{53}{12}+\frac{1}{4}\)
\(\Rightarrow\frac{4}{3}+\frac{2}{3}x=\frac{14}{3}\)
\(\Rightarrow\frac{2}{3}x=\frac{14}{3}-\frac{4}{3}\)
\(\Rightarrow\frac{2}{3}x=\frac{10}{3}\)
\(\Rightarrow x=\frac{10}{3}:\frac{2}{3}\)
\(\Rightarrow x=\frac{10}{3}\times\frac{3}{2}\)
\(\Rightarrow x=5\)
Mình làm hơi tắt một chút, bạn tự trình bày đầy đủ nhé!
Chúc bạn làm bài tốt !
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)
151 - 2 x ( x-6 ) = 2227 : 17
2 x ( x-6 ) = 131
2 x ( x-6 ) = 151 - 131
2 x ( x-6 ) = 20
x-6 = 20 : 2
x - 6 = 10
x = 10 + 6
x = 16
b)
\(\dfrac{2}{3}-\dfrac{1}{4}=\dfrac{5}{12}\\ X=\dfrac{5}{12}:\dfrac{1}{3}=\dfrac{5}{4}\)
1 / 1 x 2 = 1-1/2 và 1/2x3 = (1/2)-(1/3) tương tự đến 1/(x-1).x=(1/x-1)-(1/x). Cuối cùng ta có phép tính 1+(1/x-1)-(1/x)=15/16
\(\left(x-\frac{2}{3}\right)\cdot3=\frac{3}{4}\)
\(x-\frac{2}{3}=\frac{3}{4}:3\)
\(x-\frac{2}{3}=\frac{1}{4}\)
\(x=\frac{1}{4}+\frac{2}{3}\)
\(x=\frac{11}{12}\)
\(\left(x-\frac{2}{3}\right)x3=\frac{3}{4}\)
\(\Rightarrow x-\frac{2}{3}=\frac{3}{4}.\frac{1}{3}=\frac{1}{4}\)
\(\Rightarrow x=\frac{1}{4}+\frac{2}{3}=\frac{11}{12}\)