Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
tính nhanh :
a) ( 3 - 1/4 + 2/3 ) - ( 5 + 1/3 - 6/5 ) - ( 6 - 7/4 + 3/2 )
giúp mk vs nha mai nộp bài r
a) \(\left(3-\frac{1}{4}+\frac{2}{3}\right)-\left(5+\frac{1}{3}-\frac{6}{5}\right)-\left(6-\frac{7}{4}+\frac{3}{2}\right)\)
\(=3-\frac{1}{4}+\frac{2}{3}-5-\frac{1}{3}+\frac{6}{5}-6+\frac{7}{4}-\frac{3}{2}\)
\(=3-\frac{1}{4}+\frac{7}{4}-\frac{3}{2}+\frac{2}{3}-\frac{1}{3}-5+\frac{6}{5}-6\)
\(=3+\frac{3}{2}-\frac{3}{2}+\frac{1}{3}-11+\frac{6}{5}\)
\(=3+0+\frac{23}{15}-11\)
\(=\frac{68}{15}-\frac{165}{15}=\frac{-97}{15}.\)
có 2 cách làm mà mik làm 1 cách thôi nha !
A = (6 - 2/3 + 1/2) - (5 + 5/3 - 3/2) - (3 -7/3 + 5/2)
= ( 36/6 - 4/6 + 3/6 ) - ( 150/30 + 50/30 +45/30 ) - ( 18/6 - 14/6 + 15/6 )
= 35/6 - 155/30 - 19/6 = 35/6 - 19/6 - 155/30
= 16/6 - 155/30 = 80/30 - 155/30 = 75/30 = - 5/2
Hơi khó nhìn. Chúc hok tốt !
= 6 - (5+3) - (2/3 + 5/3 -7/3) + ( 1/2 + 3/2 -5/2 )
= 6 - 8 - 0 - 1/2
= -2 - 1/2
= -2/1/2
A = 6 - 2/3 + 1/2 - 5 - 5/3 + 3/2 - 3 + 7/3 - 5/2
A = ( 6 - 5 - 3 ) + ( -2/3 - 5/3 + 7/3 ) + ( 1/2 + 3/2 - 5/2 )
A = ( -2 ) + 0 + ( -1/2 )
A = ( -2 ) + ( -1/2 )
A = -5/2
\(\left(3-\frac{1}{4}+\frac{2}{5}\right)-\left(5+\frac{1}{3}-\frac{1}{6}\right)-\left(6-\frac{7}{4}+\frac{3}{2}\right)\)
\(=\left(\frac{60-5+8}{20}\right)-\left(\frac{90+6-3}{18}\right)-\left(\frac{48-14+12}{8}\right)\)
\(=\frac{63}{20}-\frac{93}{18}-\frac{23}{4}\)
\(=\frac{567-930-1035}{180}=-\frac{1398}{180}=-\frac{233}{30}\)
\(A=\left(6-\dfrac{2}{3}+\dfrac{1}{2}\right)-\left(5+\dfrac{5}{3}-\dfrac{3}{2}\right)-\left(3-\dfrac{7}{3}+\dfrac{5}{2}\right)\\ A=\dfrac{35}{6}-\dfrac{31}{6}-\dfrac{19}{6}=-\dfrac{15}{6}\)