Tính D= 5/6.37+ 1/6.43+ 6/7.43+ 10/7. 59
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
A = ( 6 : 3/5 - 7/6 * 6/7 ) : ( 21/5 * 10/11 + 57/11 )
A = ( 10 - 1 ) : ( 42/11 + 57/11)
A = 9 : 9
A = 1
B = 59 /10 : 3/2 - ( 7/3 * 9/2 - 2 * 7/3 ) : 7/4
B = 59/15 - ( 21/2 - 14/3 ) : 7/4
B = 59/15 - 35/6 : 7/4
B = 59/15 - 10/3
B = 3/5
a. 5/12+(7/59+7/12)
=5/12+497/708
=66/59
b.(7/30+5/16)+(1/16-7/30)
=131/240+(-41/240)
=3/8
a) \(\frac{5}{12}+\left(\frac{7}{59}+\frac{7}{12}\right)\)
\(=\frac{5}{12}+\frac{7}{59}+\frac{7}{12}\)
\(=\left(\frac{5}{12}+\frac{7}{12}\right)+\frac{7}{59}\)
\(=1\frac{7}{59}\)
b) \(\left(\frac{7}{30}+\frac{5}{16}\right)+\left(\frac{1}{16}-\frac{7}{30}\right)\)
\(=\frac{7}{30}+\frac{5}{16}+\frac{1}{16}-\frac{7}{30}\)
\(=\frac{6}{16}=\frac{3}{8}\)
c) \(\frac{3}{5.9}+\frac{3}{9.13}+\frac{3}{13.17}+...+\frac{3}{2013.2017}\)
\(=\frac{3}{4}\left(\frac{1}{5}-\frac{1}{9}+\frac{1}{9}-\frac{1}{13}+\frac{1}{13}-\frac{1}{17}+...+\frac{1}{2013}-\frac{1}{2017}\right)\)
\(=\frac{3}{4}\left(\frac{1}{5}-\frac{1}{2017}\right)\)
\(=\frac{1509}{10085}\)
d) -4 . 2 . 6 . 25 . (-7) . 5
= (-4 . 25) . (-7 . 2 . 5 . 6)
= -100 . (-420)
= 42000
e) -41 . (59 + 2) + 59 . (41 - 2)
= -41 . 59 + (-41) . 2 + 59 . 41 - 59 . 2
= (-41 . 59 + 59 . 41) + (-41 . 2 - 59 . 2)
= [59 . (-41 + 41)] + [2 . (-41 - 59)]
= (59 . 0) + [2 . (-100)]
= 0 + (-200)
= -200
f) (-5) . (-4) - 33 + (-1)2017 . (-6)
= -5 . (-4) - 27 + (-1) . (-6)
= [-5 . (-4)] - 27 + [-1 . (-6)]
= 20 - 27 + 6
= -1
1114/7