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.

c)38/45-(8/45-17/51-3/11)

=38/45-8/45+17/51+3/11

=30/45+1/3+3/11

=2/3+1/3+3/11

=3/3+3/11

=1+3/11

=1 3/11.

a, \(\left(31\frac{6}{13}+5\frac{9}{41}\right)-36\frac{6}{13}=31\frac{6}{16}+5\frac{9}{41}-36\frac{6}{13}\)

\(=\left(31\frac{6}{16}-31\frac{6}{16}\right)+5\frac{9}{41}\)

\(=0+5\frac{9}{41}=5\frac{9}{41}\)

b, \(\left(17\frac{29}{31}-3\frac{7}{8}\right)-\left(2\frac{28}{31}-4\right)=17\frac{9}{31}-3\frac{7}{8}-2\frac{28}{31}+4\)

\(17\frac{2}{31}-\left(\frac{15}{17}+6\frac{2}{31}\right)\)

\(17\frac{2}{31}=\frac{529}{31};6\frac{2}{31}=\frac{188}{31}\)

\(17\frac{2}{31}-\left(\frac{15}{17}+6\frac{2}{31}\right)\)

\(=\frac{529}{31}-\left(\frac{15}{17}+\frac{188}{31}\right)\)

\(=\frac{529}{31}-\frac{3661}{527}\)

\(=\frac{172}{17}\)

\(\left(\frac{29}{31}-\frac{7}{8}\right)-\left(\frac{28}{31}-4\right)\)

\(=\frac{15}{248}-\left(-\frac{96}{31}\right)\)

\(=\frac{783}{248}\)

a,\(\frac{31}{1000}\)

b,\(\frac{8}{108}\)

c,0

a,\(\frac{49}{97}\)

b,\(\frac{-1}{4751}\)

a/=\(27\frac{51}{59}-7\frac{51}{59}+\frac{1}{3}\)

=20+\(\frac{1}{3}\)

=\(\frac{61}{3}\)

Câu a:

(1/4 + -5/13) + (2/11 + -8/13 + 3/4)

= 1/4 - 5/13 + 2/11 - 8/13 + 3/4

= (1/4 + 3/4) - (5/13+ 8/13) + 2/11

= 1 - 1 + 2/11

= 0 + 2/11

= 2/11

Câu b:

(21/31 + -16/7) + (44/53 + 10/31) + 9/53

= 21/31 - 16/7 + 44/53 + 10/31 + 9/53

= (21/31 + 10/31) + (44/53 + 9/53) - 16/7

= 1 + 1 - 16/7

= 2 - 16/7

= -2/7

a) 31/23 - ( 7/32 + 8/22)

= 31/23 - 7/32 + 8/23

= ( 31/23 + 8/23 ) - 7/32

= 32/22 - 7/32

= 39/32

Ccá ý khác làm tương tự

=(31\23-8\23)+7\32

=23\23+7\32

=1+7\32

=39\32

=435/31-7/4-435/81+3

= -7/4+3

=5/4

\(=15\frac{29}{31}-2\frac{7}{8}-2\frac{29}{31}+3=\left(15\frac{29}{31}-2\frac{29}{31}\right)-\left(2\frac{7}{8}+3\right)\)

\(=13+5\frac{7}{8}\)\(=18\frac{7}{8}\)