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\(1-\left(\frac{12}{5}+y=\frac{8}{9}\right):\frac{16}{9}=0\)
\(1-\left(\frac{12}{5}+y-\frac{8}{9}\right)=0\times\frac{16}{9}\)
\(1-\left(\frac{12}{5}+y-\frac{8}{9}\right)=0\)
\(\frac{12}{5}+y-\frac{8}{9}=1-0\)
\(\frac{12}{5}-y+\frac{8}{9}=1\)
\(\frac{12}{5}-y=1-\frac{8}{9}\)
\(\frac{12}{5}-y=\frac{1}{9}\)
\(y=\frac{12}{5}-\frac{1}{9}\)
\(y=\frac{108}{45}-\frac{5}{45}\)
\(y=\frac{103}{45}\)
a) $\frac{{14}}{{18}}:\frac{8}{9} = \frac{7}{9}:\frac{8}{9} = \frac{7}{9} \times \frac{9}{8} = \frac{{63}}{{72}} = \frac{7}{8}$
b) $\frac{9}{6}:\frac{3}{{10}} = \frac{3}{2}:\frac{3}{{10}} = \frac{3}{2} \times \frac{{10}}{3} = \frac{{30}}{6} = 5$
c) $\frac{4}{5}:\frac{{10}}{{15}} = \frac{4}{5}:\frac{2}{3} = \frac{4}{5} \times \frac{3}{2} = \frac{{12}}{{10}} = \frac{6}{5}$
d) $\frac{1}{6}:\frac{{21}}{9} = \frac{1}{6}:\frac{7}{3} = \frac{1}{6} \times \frac{3}{7} = \frac{3}{{42}} = \frac{1}{{14}}$
Tổng của 3 phân số là:
(23/20+7/20+21/20):2=37/10
Phân số thứ nhất là:
37/10-7/20=67/20
Phân số thứ hai là:
37/10-21/20=53/20
Phân số thứ ba là:
37/10-23/20=51/20
Đáp số : phân số thứ 1:67/20
phân số thứ 2
phân số thứ 3
Đáp số: phân số thứ 1 : 67/20
phân số thứ 2 : 53/20
phân số thứ 3 : 51/20
Chúc bạn học giỏi!
\(a.\frac{3}{7}.\frac{5}{6}+\frac{5}{6}.\frac{4}{7}=\left(\frac{3}{7}+\frac{4}{7}\right).\frac{5}{6}=1.\frac{5}{6}=\frac{5}{6}\)
\(b.\frac{1}{6}:\frac{4}{5}+\frac{1}{8}:\frac{4}{5}=\left(\frac{1}{6}+\frac{1}{8}\right):\frac{4}{5}=\left(\frac{4}{24}+\frac{3}{24}\right):\frac{4}{5}=\frac{7}{24}:\frac{4}{5}=\frac{7.5}{24.4}\)\(=\frac{35}{96}\)
\(c.\frac{1}{6}:\frac{4}{5}-\frac{1}{8}:\frac{4}{5}=\left(\frac{1}{6}-\frac{1}{8}\right):\frac{4}{5}=\left(\frac{4}{24}-\frac{3}{24}\right):\frac{4}{5}\)\(=\frac{1}{24}:\frac{4}{5}=\frac{1.5}{24.4}=\frac{5}{96}\)
a) \(\frac{3}{7}\cdot\frac{5}{6}+\frac{5}{6}\cdot\frac{4}{7}\)
\(=\left(\frac{3}{7}+\frac{4}{7}\right)\cdot\frac{5}{6}\)
\(=1\cdot\frac{5}{6}\)
\(=\frac{5}{6}\)
b) \(\frac{1}{6}:\frac{4}{5}+\frac{1}{8}:\frac{4}{5}\)
\(=\left(\frac{1}{6}+\frac{1}{8}\right):\frac{4}{5}\)
\(=\frac{7}{24}:\frac{4}{5}\)
\(=\frac{35}{96}\)
c) \(\frac{1}{6}:\frac{4}{5}-\frac{1}{8}:\frac{4}{5}\)
\(=\left(\frac{1}{6}-\frac{1}{8}\right):\frac{4}{5}\)
\(=\frac{1}{24}:\frac{4}{5}\)
\(=\frac{5}{96}\)
12/5 -4/5 =8/5
11/6 -2/3 =21/18 =7/6
7/8 -2/7 =33/56
4 -8/5 =20/5-8/5 =12/5
2 -3/8 =16/8 -3/8 =13/8
16/7 -2 =16/7 -14/7 =2/7
25/4 -3=25/4 -12/4 =13/4
câu 2 : câu 3 :
a) 8/5 a)4 - 8/5 = 20/5 - 8/5 =12/5
b) 7/6 b)2 - 3/8 =16/8 - 3/8 = 13/8
c) 35/56 c)16/7 - 2 = 16/7 - 14/7 = 2/7
d)25/4 - 3 = 25/4 - 12/4 = 13/4
\(\frac{1}{2}:\frac{3}{2}:\frac{5}{4}:\frac{6}{5}:\frac{7}{6}:\frac{8}{7}\)
\(=\frac{1}{2}\cdot\frac{2}{3}\cdot\frac{4}{5}\cdot\frac{5}{6}\cdot\frac{6}{7}\cdot\frac{7}{8}\)
\(=\frac{1\cdot\left(2\cdot5\cdot6\cdot7\right)}{8\cdot3\cdot\left(2\cdot5\cdot6\cdot7\right)}\)
\(=\frac{1}{24}\)
\(\frac{1}{2}\cdot\frac{2}{3}\cdot\frac{3}{4}\cdot\frac{4}{5}\cdot\frac{5}{6}\cdot\frac{6}{7}\cdot\frac{7}{8}\cdot\frac{8}{9}\cdot\frac{9}{10}\)
\(=\frac{1\cdot\left(2\cdot3\cdot4\cdot5\cdot6\cdot7\cdot8\cdot9\right)}{\left(2\cdot3\cdot4\cdot5\cdot6\cdot7\cdot8\cdot9\right)\cdot10}\)
\(=\frac{1}{10}\)
M = (345 x (6789 + 3456 - 245)/690) x 99/100 x 98/99 x...x 2/3 x 1/2
M = ((345 x 10000)/690) x 99/2 (rút gọn)
M = (10000/2) x 99/2
M = 5000 x 99/2
M = 247500
Ok nha
1)
a) 80/95 = 16/19
144/153 = 16/17
Do 19 > 17 nên 16/19 < 16/17
⇒ 80/95 < 144/153
b) 474747/919191 = 47/91
Do 47 > 46 nên 47/91 > 46/91
⇒ 474747/919191 > 46/91
c) 21/4 = 5 + 1/4
36/7 = 5 + 1/7
Do 4 < 7 nên 1/4 > 1/7
⇒ 5 + 1/4 > 5 + 1/7
⇒ 21/4 > 36/7
d) 2021/2024 = 1265/2024 + 756/2024
= 5/8 + 189/506
⇒ 2021/2024 > 5/8
2) Tổng ba số là:
58 + 71 + 64 = 193
Số thứ nhất là:
193 - 64 × 2 = 65
Số thứ hai là:
193 - 71 × 2 = 51
Số thứ ba là:
193 - 58 × 2 = 77
\(\frac{5}{6}:\frac{8}{9}-\frac{3}{4}:\frac{8}{9}\)
\(=\left(\frac{5}{6}-\frac{3}{4}\right):\frac{8}{9}\)
\(=\frac{1}{12}:\frac{8}{9}\)
\(=\frac{1}{12}\times\frac{9}{8}\)
\(=\frac{3}{32}\)
(\(\frac{5}{6}\)-\(\frac{3}{4}\)) : \(\frac{8}{9}\)
=\(\frac{1}{12}\): \(\frac{8}{9}\)
=\(\frac{3}{32}\)
k nhé, sau đó kb lun!
a, Tính
4/9 : 2/3 = 4/9 x 3/2 = 2/3
3 : 4/5 = 15/4
4/5 : 3 = 5/15
b, 1/2 : 7/8 + 3/2 : 7/8
= 1/2 x 8/7 + 3/2 x 8/7
= 8/7 x ( 1/2 + 3/2 )
= 8/7 x 2
= 16/7
4/3 : 7/8 - 1/3 : 7/8
= 4/3 x 8/7 - 1/3 x 8/7
= 8/7 x ( 4/3 - 1/3 )
= 8/7 x 1
= 8/7
a) \(\dfrac{4}{9}:\dfrac{2}{3}=\dfrac{4}{9}\times\dfrac{3}{2}=\dfrac{2}{3}\)
\(3:\dfrac{4}{5}=3\times\dfrac{5}{4}=\dfrac{15}{4}\)
\(\dfrac{4}{5}:3=\dfrac{4}{5}\times\dfrac{1}{3}=\dfrac{4}{15}\)
b) \(\dfrac{1}{2}:\dfrac{7}{8}+\dfrac{3}{2}:\dfrac{7}{8}=\dfrac{1}{2}\times\dfrac{8}{7}+\dfrac{3}{2}\times\dfrac{8}{7}=\left(\dfrac{1}{2}+\dfrac{3}{2}\right)\times\dfrac{8}{7}=2\times\dfrac{8}{7}=\dfrac{16}{7}\)
\(\dfrac{4}{3}:\dfrac{7}{8}-\dfrac{1}{3}:\dfrac{7}{8}=\dfrac{4}{3}\times\dfrac{8}{7}-\dfrac{1}{3}\times\dfrac{8}{7}=\left(\dfrac{4}{3}-\dfrac{1}{3}\right)\times\dfrac{8}{7}=1\times\dfrac{8}{7}=\dfrac{8}{7}\)