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a x+\(\frac{1}{2}\)=\(\frac{5}{7}\)
x=\(\frac{5}{7}\)-\(\frac{1}{2}\)
x=\(\frac{3}{14}\)
b \(\frac{25}{7}\)-x=\(\frac{8}{9}\)
x=\(\frac{25}{7}\)-\(\frac{8}{9}\)
x=\(\frac{169}{43}\)
c \(\frac{15}{11}\)*x=\(\frac{5}{3}\)
x=\(\frac{5}{3}\):\(\frac{15}{11}\)
x=\(\frac{11}{9}\)
D x*\(\frac{5}{12}\)=\(\frac{8}{9}\)
x=\(\frac{8}{9}\):\(\frac{5}{12}\)
x=\(\frac{32}{15}\)
a) \(x+\frac{1}{2}=\frac{5}{7}\)
\(x=\frac{5}{7}-\frac{1}{2}\)
\(x=\frac{10}{14}-\frac{7}{14}\)
\(x=\frac{3}{14}\)
b) \(\frac{25}{7}-x=\frac{8}{9}\)
\(x=\frac{25}{7}-\frac{8}{9}\)
\(x=\frac{225}{63}-\frac{56}{63}\)
\(x=\frac{169}{63}\)
c) \(\frac{15}{11}\cdot x=\frac{5}{3}\)
\(x=\frac{5}{3}:\frac{15}{11}\)
\(x=\frac{5}{3}\cdot\frac{11}{15}\)
\(x=\frac{11}{9}\)
d) \(x\cdot\frac{5}{12}=\frac{8}{9}\)
\(x=\frac{8}{9}:\frac{5}{12}\)
\(x=\frac{8}{9}\cdot\frac{12}{5}\)
\(x=\frac{32}{15}\)
\(\dfrac{22}{5}\times\dfrac{6}{121}\times\dfrac{11}{4}\times\dfrac{3}{5}\times\dfrac{1}{3}\times\dfrac{5}{4}\)
\(=\left(\dfrac{22}{5}\times\dfrac{5}{4}\right)\times\left(\dfrac{6}{121}\times\dfrac{11}{4}\right)\times\left(\dfrac{3}{5}\times\dfrac{1}{3}\right)\)
\(=\dfrac{11}{2}\times\dfrac{3}{22}\times\dfrac{1}{5}\)
\(=\dfrac{3}{20}\)
\(=\dfrac{22\times6\times11\times3\times1\times5}{5\times121\times4\times5\times3\times4}=\dfrac{11\times2\times6\times11\times1}{11\times11\times4\times5\times4}=\dfrac{2\times6\times1}{4\times5\times4}=\dfrac{18}{100}=\dfrac{9}{50}\)
\(\left(x-12,5\right):\frac{3}{4}=\frac{8}{5}\)
\(x-12,5=\frac{8}{5}.\frac{3}{4}\)
\(x-12,5=\frac{6}{5}\)
\(x=\frac{6}{5}+12,5\)
\(x=\frac{137}{10}\)
\(\left(x-\frac{2}{5}\right)\times\frac{5}{11}=\frac{75}{22}\)
\(x-\frac{2}{5}=\frac{75}{22}:\frac{5}{11}\)
\(x-\frac{2}{5}=\frac{15}{2}\)
\(x=\frac{15}{2}+\frac{2}{5}\)
\(x=\frac{79}{10}\)
\(\left(\frac{3}{5}-x\right)+\frac{13}{20}=\frac{5}{6}\)
\(\frac{3}{5}-x=\frac{5}{6}-\frac{13}{20}\)
\(\frac{3}{5}-x=\frac{11}{60}\)
\(x=\frac{3}{5}-\frac{11}{60}\)
\(x=\frac{5}{12}\)
\(\left(x-\frac{1}{2}\right)\cdot\frac{5}{3}=\frac{7}{4}-\frac{1}{2}\)
\(\left(x-\frac{1}{2}\right)\cdot\frac{5}{3}=\frac{5}{4}\)
\(x-\frac{1}{2}=\frac{5}{4}:\frac{5}{3}\)
\(x-\frac{1}{2}=\frac{3}{4}\)
\(x=\frac{3}{4}+\frac{1}{2}\)
\(x=\frac{5}{4}\)
( 3/5 - x ) + 13/20 = 5/6
3/5 - x = 5/6 - 13/20
3/5 - x = 89/60
x = 3/5 - 89/60
x = 25/12
( x - 1/2 ) x 5/3 = 7/4 - 1/2
( x - 1/2 ) x 5/3 = 5/4
x - 1/2 = 5/4 : 5/3
x - 1/2 = 35/12
x = 35/12 + 1/2
x = 41/12
a.x : 0,15 = (2,8 + 0,38) : 0,75
x : 0,15 =3,18 : 0,75
x : 0,15 = 4.24
x = 4,24 . 0,15
x = 0.636
b.5/12 : x = (5/6 - 1/2) . 5/4
5/12 : x = 1/3 . 5/4
5/12 : x = 5/12
x = 5/12 : 5/12
x = 1
1 giờ 20 phút x 5 + 20 phút x 5 + 1,5 giờ x 5
= ( 1 giờ 20 phút + 20 phút + 1 giờ 30 phút ) x 5
= 3 giờ 10 phút x 5
= 15 giờ 50 phút
Học tốt nhé bạn !
1 giờ 20 phút x 5 + 20 phút x 5 + 1,5 phút x 5
= ( 1 giờ 20 phút + 20 phút + 1,5 phút ) x 5
= 101,5 phút x 5
= 507,5 phút
Bài 1:
câu a: 4\(\dfrac{4}{9}\) : 2\(\dfrac{2}{3}\) + 3\(\dfrac{1}{6}\)
= \(\dfrac{40}{9}\) : \(\dfrac{8}{3}\) + \(\dfrac{19}{6}\)
= \(\dfrac{5}{3}\) + \(\dfrac{19}{6}\)
= \(\dfrac{10}{6}\) + \(\dfrac{19}{6}\)
= \(\dfrac{29}{6}\)
b, (15,25 + 3,75) \(\times\) 4 + ( 20,71 + 5,29)\(\times\) 5
= 19 \(\times\) 4 + 26 \(\times\) 5
= 76 + 130
= 206
c, \(\dfrac{4}{5}\) \(\times\) \(\dfrac{1}{2}\) + \(\dfrac{4}{5}\) \(\times\) \(\dfrac{1}{3}\) - \(\dfrac{4}{5}\) \(\times\) \(\dfrac{1}{4}\)
= \(\dfrac{2}{5}\) + \(\dfrac{4}{15}\) - \(\dfrac{1}{5}\)
= \(\dfrac{6}{15}\) + \(\dfrac{4}{15}\) - \(\dfrac{3}{15}\)
= \(\dfrac{7}{15}\)
d, 1\(\dfrac{5}{7}\) + 7\(\dfrac{3}{6}\) + 2\(\dfrac{2}{7}\) - 4\(\dfrac{3}{6}\)
= (1 + 2 + \(\dfrac{5}{7}\) + \(\dfrac{2}{7}\)) + ( 7 + \(\dfrac{3}{6}\) - 4 - \(\dfrac{3}{6}\))
= 3 + 1 + 3
= 7
\(\frac{9}{10}\)x\(\frac{5}{6}\)=\(\frac{45}{60}\)=\(\frac{45}{10}\)câu này thì mk thấy nó sao sao ấy!
a) \(\frac{4}{3}\)x\(\frac{9}{10}\)=\(\frac{12}{10}\)
mk rút gọn tất cả lun nha!!
b) \(\frac{9}{26}\):\(\frac{27}{8}\)=\(\frac{18}{39}\)
c) \(\frac{40}{7}\):\(\frac{5}{14}\)=16
=50:25 x 10
=2 x 10
=20
hok tốt
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