A) 1/7 14/2 + 1/8 + 2/9 0.3= 2/7 + 1/8 + 0.6/9= 2/7 + 1/8 + 2/30= 60/210 + 26/210 + 14/210= (60 + 26 + 14) / 210= 100 / 210= 10 / 21
B) 13/16 1/26 - 7/8 (1/5 + 4/7)= 13/16 1/26 - 7/8 (7/35 + 20/35)= 13/416 - 7/8 * 27/35= 13/416 - 189/280= 65/2080 - 189/280= 65/2080 - 13572/2080= (65 - 13572) / 2080= -13507 / 2080
A) 1/7 14/2 + 1/8 + 2/9 0.3
= 2/7 + 1/8 + 0.6/9
= 2/7 + 1/8 + 2/30
= 60/210 + 26/210 + 14/210
= (60 + 26 + 14) / 210
= 100 / 210
= 10 / 21
B) 13/16 1/26 - 7/8 (1/5 + 4/7)
= 13/16 1/26 - 7/8 (7/35 + 20/35)
= 13/416 - 7/8 * 27/35
= 13/416 - 189/280
= 65/2080 - 189/280
= 65/2080 - 13572/2080
= (65 - 13572) / 2080
= -13507 / 2080