Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a. 45 - 12 - 5 - 23
= ( 45 - 5 ) - ( 12 + 23 )
= 40 - 40
= 0
b. 2534 - 150 - 834
= ( 2534 - 834 ) - 150
= 1700 - 150
= 1550.
d. \(\frac{7}{3}-\frac{11}{5}-\frac{4}{5}\)
= \(\frac{7}{3}-\left(\frac{11}{5}+\frac{4}{5}\right)\)
= \(\frac{7}{3}-3\)
= \(\frac{-2}{3}\)
e. \(\frac{18}{13}+\frac{55}{46}+\frac{5}{13}\)
= \(\left(\frac{18}{13}+\frac{5}{13}\right)+\frac{55}{46}\)
= \(\frac{23}{13}+\frac{55}{46}\)
= \(\frac{1753}{598}\)
f. \(\left(\frac{27}{25}-\frac{4}{9}\right)-\left(\frac{2}{25}-\frac{5}{9}\right)\)
\(=\frac{27}{25}-\frac{4}{9}-\frac{2}{25}+\frac{5}{9}\)
\(=\left(\frac{27}{25}-\frac{2}{25}\right)-\left(\frac{4}{9}+\frac{5}{9}\right)\)
\(=1-1\)
\(=0\)
h. 8,275 - 1,56 - 3,215
= ( 8,275 - 3,215 ) - 1,56
= 5,06 - 1,56
= 3,5
j. 18,72 - 9,6 - 3,72 - 0,4
= ( 18,72 - 3,72 ) - ( 9,6 + 0,4 )
= 15 - 10
= 5
k. 46,55 + 20,33 + 25,67
= 46,55 + ( 20,33 + 25,67 )
= 46,55 + 46
= 92,55
l. 20 - 0,5 - 1,5 - 2,5 - 3,5 - 4,5 - 6,5
= 20 - ( 0,5 + 1,5 + 2,5 + 3,5 + 4,5 + 6,5 )
= 20 - 19
= 1
Không biết có đúng không nữa❤
a, 3 \(\frac{14}{19}\)+ \(\frac{13}{17}\)+ \(\frac{35}{43}\)+ 6\(\frac{5}{19}\)+ \(\frac{8}{43}\)= \(\left(3\frac{14}{19}+6\frac{5}{19}\right)+\left(\frac{35}{43}+\frac{8}{43}\right)+\frac{13}{17}=\)\(9+1+\frac{13}{17}=8+\frac{13}{17}=8\frac{13}{17}\)
b, \(\frac{-5}{7}.\frac{2}{11}+\frac{-5}{7}.\frac{9}{11}+1\frac{5}{7}\)\(=\frac{-5}{7}\left(\frac{2}{11}+\frac{9}{11}\right)+1\frac{5}{7}\)\(=\frac{-5}{7}.1+1\frac{5}{7}\)\(=\frac{-5}{7}+\frac{12}{7}=\frac{7}{7}=1\)
Chúc bn học tốt
\(3\frac{14}{19}+\frac{13}{17}+\frac{35}{43}+6\frac{5}{19}+\frac{8}{43}\)
\(=\left(3\frac{14}{19}+6\frac{5}{19}\right)+\left(\frac{35}{43}+\frac{8}{43}\right)+\frac{13}{17}\)
\(=10+1+\frac{13}{17}=11+\frac{13}{17}=11\frac{13}{17}\)
\(3\frac{14}{19}+\frac{13}{17}+\frac{35}{43}+6\frac{5}{19}+\frac{8}{43}\)
\(=\left(3\frac{14}{19}+6\frac{5}{19}\right)+\left(\frac{35}{43}+\frac{8}{43}\right)+\frac{13}{17}\)
\(=10+1+\frac{13}{17}=11+\frac{13}{17}=11\frac{13}{17}\)
\(\frac{-5}{7}.\frac{2}{11}+\frac{-5}{7}.\frac{9}{11}+1\frac{5}{7}\)
\(=\frac{-5}{7}.\frac{2}{11}+\frac{-5}{7}.\frac{9}{11}+1+\frac{-5}{7}.\left(-1\right)\)
\(=\frac{-5}{7}\left(\frac{2}{11}+\frac{9}{11}-1\right)+1\)
\(=\frac{-5}{7}.0+1==0+1=1\)
Trả lời
b)(1/3+12/67+13/41)-(79/67-28/41)
=1/3+12/67+13/41-79/67+28/41
=1/3+(12/67-79/67)+(13/41+28/41)
=1/3+(-67/67)+41/41
=1/3+(-1)+1
=1/3+0
=1/3.
a, \(\frac{34}{13}-\frac{19}{28}-\frac{3}{31}=>\left(\frac{34}{13}-\frac{3}{31}\right)-\frac{19}{28}\)
= \(1-\frac{19}{28}=\frac{9}{28}\)
b, \(b,\frac{7}{3}-\left(\frac{11}{5}+\frac{4}{5}\right)\)
= \(\frac{7}{3}-3=>\frac{7}{3}-\frac{9}{3}=\frac{-2}{3}\)
c, \(\frac{18}{13}+\frac{55}{46}-\frac{5}{13}=\left(\frac{18}{13}-\frac{5}{13}\right)+\frac{55}{46}\)
= \(1+\frac{55}{46}=\frac{46}{46}+\frac{55}{46}=\frac{101}{46}\)
đúng nha 100%