Lời giải:

$A=\frac{15-5}{5.15}+\frac{31-15}{15.31}+\frac{45-31}{31.45}+\frac{52-45}{45.52}+\frac{65-52}{52.65}+\frac{1}{13.70}+\frac{1}{70.15}$

$=\frac{1}{5}-\frac{1}{15}+\frac{1}{15}-\frac{1}{31}+\frac{1}{31}-\frac{1}{45}+\frac{1}{45}-\frac{1}{52}+\frac{1}{52}-\frac{1}{65}+\frac{1}{70}(\frac{1}{13}+\frac{1}{15})$

$=\frac{1}{5}-\frac{1}{65}+\frac{1}{70}.\frac{28}{195}$

$=\frac{12}{65}+\frac{2}{95}$

$=\frac{254}{1325}$

\(\frac{16}{15.31}+\frac{14}{31.45}+\frac{7}{45.52}+\frac{13}{52.65}+\frac{1}{13.70}\)

\(=\frac{16}{15.31}+\frac{14}{31.45}+\frac{7}{45.52}+\frac{13}{52.65}+\frac{5}{65.70}\)

\(=\frac{1}{15}-\frac{1}{31}+\frac{1}{31}-\frac{1}{45}+\frac{1}{45}-\frac{1}{52}+\frac{1}{52}-\frac{1}{65}+\frac{1}{65}-\frac{1}{70}=\frac{1}{15}-\frac{1}{70}=\frac{11}{210}\)

= 1/15 - 1/31 + 1/31 - 1/45 + 1/45 - 1/52 + 1/52 - 1/65 + 1/13.70

= 1/15 - 1/65 + 1/13.70

= 2/39 + 1/910

= 11/210

Tk mk nha

=(1/15-1/31+1/31-1/45+1/45-1/52+1/52-1/65)+1/910

​=(1/15-1/65)+1/910

​=2/39+1/910=140/2730+3/2730=11/210

​Tk mình nha bn !

​

. Tham khảo nha !!! 

\(\frac{16}{15.31}+\frac{14}{31.45}+\frac{7}{45.52}+\frac{7}{52.65}+\frac{1}{13.70}\)

\(=\frac{16}{15.31}+\frac{14}{31.45}+\frac{7}{45.52}+\frac{7}{52.65}+\frac{5}{65.70}\)

\(=\frac{1}{15}-\frac{1}{31}+\frac{1}{31}-\frac{1}{45}+\frac{1}{45}-\frac{1}{52}+\frac{1}{52}-\frac{1}{65}+\frac{1}{65}-\frac{1}{70}\)

\(=\frac{1}{15}-\frac{1}{70}\)

\(=\frac{70}{1050}-\frac{15}{1050}\)

\(=\frac{55}{1050}\)

\(=\frac{11}{210}\)

Chúc bạn học tốt !!! 

37/663

giúp mk đi, mai mk nộp rùi đó

a)=(3/8+10/16)+(7/12+10/24)

=1+1=2

c)=(4/6+14/6)+(7/13+19/13)+(17/9+1/9)

=3+2+2=7

1/2*4/3-20/3*4/5

Jang Ha Na thui đê, lấy **** hả 

a, chết òi, làm chay thui @@ 

cố hỉu nha bn:

a, A = (-1/2)² - |-7/8| - 5/12 - 3/4

       = 1/4 - 7/8 - 5/12 - 3/4

       = ( 1/4 - 3/4 ) - ( 7/8 - 5/12 )

       = -1/2 - 11/24

       = -23/24