Tìm y
y ✖ 2 + y ✖ \(\dfrac{1}{5}\) = \(1\dfrac{3}{5}\) giúp mik với mik cần rất chi là gấp
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Tìm x
x ✖ 3 ✖ \(\dfrac{1}{3}\)= \(2\dfrac{2}{3}\) giúp với mik cần gấp
⇔\(x\) x 1=\(\dfrac{8}{3}\)
⇔\(x\) =\(\dfrac{8}{3}\)
Vậy \(x\)=\(\dfrac{8}{3}\)
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\(x\times3\times\dfrac{1}{3}=2\dfrac{2}{3}\\x\times3\times\dfrac{1}{3}=\dfrac{8}{3}\\ x\times3=\dfrac{8}{3}:\dfrac{1}{3}\\ x\times3=8\\ x=8:3\\ x=\dfrac{8}{3}\)
\(\Rightarrow x=\dfrac{8}{3}\)
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Tìm x
x + \(\dfrac{1}{2}\)✖\(\dfrac{1}{3}\)=\(\dfrac{3}{4}\) giúp mik với mik cần gấp ạ
\(\Rightarrow x+\dfrac{1}{6}=\dfrac{3}{4}\\ \Rightarrow x=\dfrac{7}{12}\)
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\(x+\dfrac{1}{6}=\dfrac{3}{4}\)
nên x=7/12
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Xem thêm câu trả lời
( 1 - \(\dfrac{1}{2}\) ) ✖ ( 1 - \(\dfrac{1}{3}\) ) ✖ ( 1 - \(\dfrac{1}{4}\) ) ✖ ( 1 - \(\dfrac{1}{5}\) ) ✖ ( 1 - \(\dfrac{1}{6}\) ) ✖ ( 1 - \(\dfrac{1}{7}\) ) ✖ (1 - \(\dfrac{1}{8}\))
\(=\dfrac{1}{2}\cdot\dfrac{2}{3}\cdot...\cdot\dfrac{7}{8}=\dfrac{1}{8}\)
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`= 1/2 xx 2/3 xx...xx 7/8`
`= 1/8`
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\(=\dfrac{1}{2}\times\dfrac{2}{3}\times\dfrac{3}{4}\times...\times\dfrac{6}{7}\times\dfrac{7}{8}\\ =\dfrac{1}{8}\)
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Xem thêm câu trả lời
\(\dfrac{-5}{13}\)✖\(\dfrac{3}{7}\)-\(\dfrac{2}{17}\)✖\(\dfrac{8}{13}\)+\(\dfrac{5}{13}\)✖\(\dfrac{1}{7}\)
Giải hộ mình nhé có cả lời giải đấy
ok.mình cho 1 tim
Ta có: \(\dfrac{-5}{13}\cdot\dfrac{3}{7}-\dfrac{2}{17}\cdot\dfrac{8}{13}+\dfrac{5}{13}\cdot\dfrac{1}{7}\)
\(=\dfrac{5}{13}\left(-\dfrac{3}{7}+\dfrac{1}{7}\right)-\dfrac{2}{17}\cdot\dfrac{8}{13}\)
\(=\dfrac{5}{13}\cdot\dfrac{-2}{7}-\dfrac{2}{17}\cdot\dfrac{8}{13}\)
\(=\dfrac{-10}{91}-\dfrac{16}{221}\)
\(=\dfrac{-282}{1547}\)
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\(\dfrac{-5}{13}.\dfrac{3}{7}-\dfrac{2}{17}.\dfrac{8}{13}+\dfrac{5}{13}.\dfrac{1}{7}\)
\(=\dfrac{5}{13}.\dfrac{-3}{7}-\dfrac{2}{17}.\dfrac{8}{13}+\dfrac{5}{13}.\dfrac{1}{7}\)
\(=\dfrac{5}{13}.\left(\dfrac{-3}{7}+\dfrac{1}{7}\right)+\dfrac{-2}{17}.\dfrac{8}{13}\)
\(=\dfrac{5}{13}.\dfrac{-2}{7}+\dfrac{-2}{13}.\dfrac{8}{17}\)
\(=\dfrac{-2}{13}.\dfrac{5}{7}+\dfrac{-2}{13}.\dfrac{8}{17}\)
\(=\dfrac{-2}{13}.\left(\dfrac{5}{7}+\dfrac{8}{17}\right)\)
\(=\dfrac{-2}{13}.\dfrac{141}{119}\)
\(=\dfrac{-282}{1547}\)
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Tìm y :
102,5 : ( y - 69,3 ) = 5
Tính giá trị biểu thức
a) 365,4 : ( 25,2 + 18,3 ) - ( 40 - 32,3 ) ✖ 0,2
b) \(\dfrac{2}{5}\): ( \(\dfrac{4}{5}\) - \(\dfrac{1}{2}\) ) + \(\dfrac{3}{4}\)
Bài 1:
=>y-69,3=20,5
hay y=89,8
Bài 2:
a: \(=365.4:43.5-7.7\cdot0.2\)
=8,4-1,54=6,86
b: \(=\dfrac{2}{5}:\dfrac{8-5}{10}+\dfrac{3}{5}=\dfrac{2}{5}\cdot\dfrac{10}{3}+\dfrac{3}{5}=\dfrac{20+9}{15}=\dfrac{29}{15}\)
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B=(1-\(\dfrac{1}{3}\)) ✖(1-\(\dfrac{1}{6}\))✖(1-\(\dfrac{1}{10}\))✖(1-\(\dfrac{1}{15}\))✖....✖(1-\(\dfrac{1}{780}\))
\(B=\left(1-\dfrac{1}{3}\right)\cdot\left(1-\dfrac{1}{6}\right)\cdot\left(1-\dfrac{1}{10}\right)\cdot\left(1-\dfrac{1}{15}\right)\cdot...\cdot\left(1-\dfrac{1}{780}\right)\)
\(B=\left(1-\dfrac{1}{3+6+10+15+...+780}\right)\)
\(B=\left(1-\dfrac{1}{\left(780-3\right)\div3+1}\right)\)
\(B=\left(1-\dfrac{1}{260}\right)\)
\(B=\dfrac{259}{260}\)
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Thực hiện phép tính (tính nhanh nếu có thể)
c) \(5\dfrac{2}{5}\)✖\(4\dfrac{2}{7}\)+\(5\dfrac{5}{7}\)✖\(5\dfrac{2}{5}\)
d) 75%-\(1\dfrac{1}{2}\)+0,5:\(\dfrac{5}{12}\)-\(\left(\dfrac{-1}{2}\right)^2\)
60% ✖ y + \(\dfrac{3}{5}\) ✖ y + y = 19,8
Lời giải:
$60\text{%}\times y+\frac{3}{5}\times y+y=19,8$
$\frac{3}{5}\times y+3,5\times y+y=19,8$
$y\times (\frac{3}{5}+\frac{3}{5}+1)=19,8$
$y\times 2,2=19,8$
$y=19,8:2,2=9$
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60% ✖ y + \(\dfrac{3}{5}\) ✖ y + y = 19,8