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a) \(\dfrac{24}{25}-x=\dfrac{3}{5}\)
\(x=\dfrac{24}{25}-\dfrac{3}{5}\)
\(x=\dfrac{24}{25}-\dfrac{15}{25}\)
\(x=\dfrac{9}{25}\)
b) \(\dfrac{4}{7}-\dfrac{x}{21}=\dfrac{10}{21}\)
\(\dfrac{x}{21}=\dfrac{4}{7}-\dfrac{10}{21}\)
\(\dfrac{x}{21}=\dfrac{12}{21}-\dfrac{10}{21}\)
\(\dfrac{x}{21}=\dfrac{2}{21}\)
\(x=2\)
a) 24/25 - x = 3/5
x =24/25 - 3/5
x = 24/25 - 15/25
x = 9/15
x = 3/5
Vậy x = 3/5
b)4/7 - x/21 = 10/21
x/21 = 4/7 - 10/21
x/21 = 12/21 - 10/21
x/21 = 2/21
vậy x = 2
----------------nếu thấy đúng thì cho mình xin 1like nhó-------------------------
\(16:\left(\frac{3}{5}x+\frac{8}{21}+9\right)=\frac{7}{10}\)
\(\frac{3}{5}x+\frac{8}{21}+9=\frac{160}{7}\)
\(\frac{3}{5}x=\frac{283}{21}\)
\(x=\frac{1415}{63}\)
Vậy ...
\(\dfrac{15}{14}\): \(\dfrac{10}{21}\) \(\times\) \(\dfrac{1}{5}\) = \(\dfrac{15}{14}\) \(\times\) \(\dfrac{21}{10}\) \(\times\) \(\dfrac{1}{5}\) = \(\dfrac{5\times3\times7\times3}{7\times2\times10\times5}\) = \(\dfrac{9}{20}\)
5 \(\times\) \(\dfrac{1}{5}\) + \(\dfrac{1}{5}\) = 1 + \(\dfrac{1}{5}\) = \(\dfrac{6}{5}\)
7 : \(\dfrac{1}{5}\) - \(\dfrac{1}{5}\) = 35 - \(\dfrac{1}{5}\) = \(\dfrac{174}{5}\)
6 + \(\dfrac{1}{5}\): 2 = 6 + \(\dfrac{1}{10}\) = \(\dfrac{61}{10}\)
8 - \(\dfrac{1}{5}\) \(\times\) 7 = 8 - \(\dfrac{7}{5}\) = \(\dfrac{33}{5}\)
\(\dfrac{15}{14}\) : \(\dfrac{10}{21}\) x \(\dfrac{1}{5}\) = \(\dfrac{15}{14}\) x \(\dfrac{21}{10}\) x \(\dfrac{1}{5}\) = \(\dfrac{9}{4}\) x \(\dfrac{1}{5}\) = \(\dfrac{9}{20}\)
5 x \(\dfrac{1}{5}\) + \(\dfrac{1}{5}\) = \(\dfrac{5}{1}\) x \(\dfrac{1}{5}\) + \(\dfrac{1}{5}\) = 1 x \(\dfrac{1}{5}\) = \(\dfrac{1}{5}\)
7 : \(\dfrac{1}{5}-\dfrac{1}{5}\) = \(\dfrac{7}{1}\) x \(\dfrac{5}{1}-\dfrac{1}{5}\) = \(\dfrac{35}{1}\) - \(\dfrac{1}{5}\) = \(\dfrac{175}{5}\) - \(\dfrac{1}{5}\) = \(\dfrac{174}{5}\)
6 + \(\dfrac{1}{5}\) : 2 = \(\dfrac{6}{1}\) + \(\dfrac{1}{5}\) x \(\dfrac{1}{2}\) = \(\dfrac{6}{1}+\dfrac{1}{10}\) = \(\dfrac{60}{10}\) + \(\dfrac{1}{10}\) = \(\dfrac{61}{10}\)
8 - \(\dfrac{1}{5}\) x 7 = \(\dfrac{8}{1}\) - \(\dfrac{1}{5}\) x \(\dfrac{7}{1}\) = \(\dfrac{8}{1}-\dfrac{7}{5}\) = \(\dfrac{40}{5}\) - \(\dfrac{7}{5}\) = \(\dfrac{33}{5}\)
Sai Báo Lại Mình Nha!
\(16\div\left(\frac{3}{5}\times x+8+\frac{9}{21}\right)=\frac{7}{10}\)
\(\Rightarrow\frac{3}{5}x+\frac{59}{7}=\frac{160}{7}\)
\(\Rightarrow\frac{3}{5}x=\frac{101}{7}\)
\(\Rightarrow x=\frac{35}{303}\)
~Study well~
#KSJ
\(16:\left(\frac{3}{5}.x+8+\frac{9}{21}\right)=\frac{7}{10}\)
\(\frac{3}{5}x+\frac{59}{7}=\frac{160}{7}\)
\(\frac{3}{5}x=\frac{101}{7}\)
\(x=\frac{35}{303}\)
a) 15 x 21 - 16 : 4 + 7
= 315 - 4 + 7
= 311 + 7
= 318
b) 123 - 11 x 6 + 150 : 30
= 123 - 66 + 5
= 57 + 5
= 62
Mình chỉ làm đến đó thôi chứ mấy câu còn lại khó hiểu quá!Ở lớp 5 mình chưa học bao giờ.
a)
=315-4+7=318
b)
=123-66+5=62
c)
=2017+5x[300-700:7]
=2017+5x[300-100]
=2017+5x200
=2017+1000
=3017
d)
=1560:[5x79-370+5x21]
=1560:[395-370+105]
=1560:130
=12
e)
=50-[12:2+34]
=50-40
=10
g)
=10-[16x5+88]:28
=10-168:28
=10-6
=4
( 1/3+1/6+1/10+1/15+1/21) : x =5/7
5/7: x = 5/7
x = 5/7 : 5/7
x = 1
tk giùm nhé! chúc học giỏi!
ta có : ( 1/3 + 1/6 + 1/10 + 1/15 + 1/21 ) :x =5/7
=> 5/7 : x = 5/7
=> x = 5/7 : 5/7
x = 1
vậy x=1
10/21 :x =5/7
= x = 10/21 : 5/7
= x = 2/3
`10/21 :x=5/7`
`x=10/21:5/7`
`x=10/21 xx 7/5`
`x=2/3`