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10 tháng 3 2022
a: =9+7=16
b: =11+3/13-2-4/7-5-3/13
=4-4/7
=28/7-4/7=24/7
c: =2/7(5+1/4-3-1/4)=2/7x2=4/7
14 tháng 4 2022
a: \(\dfrac{3}{5}-\dfrac{7}{4}=\dfrac{12}{20}-\dfrac{35}{20}=\dfrac{-23}{20}\)
b: \(\dfrac{4}{5}:\dfrac{-8}{15}=\dfrac{-4}{5}\cdot\dfrac{15}{8}=\dfrac{-60}{40}=\dfrac{-3}{2}\)
c: \(=7+\dfrac{5}{9}-2-\dfrac{3}{4}-3-\dfrac{5}{9}=2-\dfrac{3}{4}=\dfrac{5}{4}\)
d: \(=\dfrac{-3}{7}\left(\dfrac{4}{19}+\dfrac{15}{19}\right)+\dfrac{5}{7}=\dfrac{2}{7}\)
KV
4 tháng 12 2023
a) 1/2 + 3/4 - (3/4 - 4 - 5)
= 1/2 + 3/4 - 3/4 + 4 + 5
= (3/4 - 3/4) + (4 + 5) + 1/2
= 0 + 9 + 1/2
= 19/2
b) [9/16 + 8/(-27)] - (19/27- 7/16 - 2)
= 9/16 - 8/27 - 19/27 + 7/16 + 2
= (9/16 + 7/16) + (-8/27 - 19/27) + 2
= 1 - 1 + 2
= 2
c) -5/8 . [4/9 + 7/(-12)]
= -5/8 . (-5/36)
= 25/288
d) 7/10 . (-3/5) + 7/10 . (-2/5) - (-3/10)
= 7/10 . (-3/5 - 2/5) + 3/10
= 7/10 . (-1) + 3/10
= -2/5
e) -3/7 . 5/9 + 4/9 . (-3/7) + 2 3/7
= -3/7 . (5/9 + 4/9) + 17/7
= -3/7 . 1 + 17/7
= 2
f) 8 2/7 - (3 4/9 + 4 2/7)
= 8 + 2/7 - 3 - 4/9 - 4 - 2/7
= (8 - 3 - 4) + (2/7 - 2/7) - 4/9
= 1 - 4/9
= 5/9
h) 3.(-1/2)² - (4/5 + 8/15) : 5/6
= 3.1/4 - 4/3 : 5/6
= 3/4 - 8/5
= -17/20
D
15 tháng 6 2018
\(1/\)
\(\frac{12}{49}:\frac{16}{21}\)
\(=\frac{12}{49}\times\frac{21}{16}\)
\(=\frac{12\times21}{49\times16}\)
\(=\frac{252}{784}=\frac{9}{28}\)
\(2/\)
\(a,\frac{5}{11}-\left(\frac{39}{61}+\frac{12}{61}\right)\)
\(=\frac{5}{11}-\frac{51}{61}\)
\(=-\frac{256}{671}\)
\(b,\frac{17}{12}+\frac{9}{7}-\left(\frac{2}{7}-\frac{7}{12}\right)\)
\(=\frac{17}{12}+\frac{9}{7}-\frac{2}{7}+\frac{7}{12}\)
\(=\left(\frac{17}{12}+\frac{7}{12}\right)+\left(\frac{9}{7}-\frac{2}{7}\right)\)
\(=2+1\)
\(=3\)
\(c,\frac{16}{17}\times\frac{12}{19}+\frac{16}{17}\times\frac{7}{19}\)
\(=\frac{16}{17}\times\left(\frac{12}{19}+\frac{7}{19}\right)\)
\(=\frac{16}{17}\times1\)
\(=\frac{16}{17}\)
D
15 tháng 6 2018
\(3/\)
\(a,x:\frac{4}{5}=\frac{25}{8}:\frac{5}{4}\)
\(x:\frac{4}{5}=\frac{5}{2}\)
\(x=2\)
\(b,\frac{22}{5}:x=\frac{44}{5}:\frac{5}{2}\)
\(\frac{22}{5}:x=\frac{88}{25}\)
\(x=\frac{5}{4}\)
\(c,x\times\frac{4}{9}\times\frac{15}{18}=\frac{25}{18}\)
\(x\times\frac{4}{9}=\frac{5}{3}\)
\(x=\frac{15}{4}\)
19 tháng 1 2022
1: \(=-\dfrac{3}{4}+3-\dfrac{1}{4}-\dfrac{5}{4}+\dfrac{9}{2}=-\dfrac{9}{4}+3+\dfrac{9}{2}=\dfrac{-9+12+18}{4}=\dfrac{21}{4}\)
2: \(=\dfrac{-5}{7}\left(\dfrac{13}{19}+\dfrac{6}{19}\right)+\dfrac{5}{7}=\dfrac{-5}{7}+\dfrac{5}{7}=0\)
3: \(=\dfrac{2}{5}\left(1-\dfrac{8}{3}-\dfrac{5}{8}\right)=\dfrac{2}{5}\cdot\dfrac{-55}{24}=\dfrac{-11}{12}\)
NV
0
-3/-7+5/19+(-4/7)=16/133