Question

tinh 

m=9/40-11/60+13/84-15/112

ai giai tui tich ( giải cách thuận tiện)

Answer 1

M = \(\frac{9}{40}\)- \(\frac{11}{60}\)+\(\frac{13}{84}\)- \(\frac{15}{112}\)

M = 378/1680 - 308/1680+ 260/1680- 225/1680

M = 105/1680

Answer 2

\(\frac{9}{40}-\frac{11}{60}+\frac{13}{84}-\frac{15}{112}=\frac{27}{120}-\frac{22}{120}+\frac{13}{84}-\frac{15}{112}=\frac{1}{24}+\frac{13}{84}-\frac{15}{112}=\frac{7}{168}+\frac{26}{168}-\frac{15}{112}=\frac{11}{56}-\frac{15}{112}=\frac{22}{112}-\frac{15}{112}=\frac{7}{112}=\frac{1}{16}\)

Answer 3

Cách thuân tiện nè:

M = ( 9/40 - 11/60) + 13/84-15/112

M=(  27/120-22/120) + 13/84 - 15/112

M = 1/24 + 13/84 - 15/112

M= ( 1/24 + 13/84) - 15/112

M = (7/168 + 26/168) - 15/112

M = 33/168 - 15/112 

M = 11/56 - 15/112

M = 22/112 - 15/112

M = 7/112