`#0409`

`6,`

`A=(0,375-0,3+3/11+3/12)/(-0,625+0,5-5/11-5/12)+(1,5+1-0,75)/(2,5+5/3-1,25)`

`=(0,375-0,3+3/11+3/12)/(-5/3 . (0,375-0,3+3/11+3/12))+(1,5+1-0,75)/(5/3 . (1,5+1-0,75))`

`=1/(-5/3) + 1/(5/3)`

`=-3/5+3/5`

`=0`

`B=(1/3-1/7-1/13)/(2/3-2/7-2/13) xx (1/3-0,25+0,2)/(1 1/6-0,875+0,7)+6/7`

`=(1/3-1/7-1/13)/(2 . (1/3-1/7-1/13)) xx (1/3-0,25+0,2)/(7/2 . (1/3-0,25+0,2))+6/7`

`=1/2 xx 1/(7/2)+6/7`

`=1/2 xx 2/7+6/7`

`=1/7+6/7`

`=1` 

`7,`

`(8 5/11+3 5/8)-3 5/11`

`=8 5/11+3 5/8-3 5/11`

`=(8 5/11-3 5/11)+3 5/8`

`=(8+5/11-3-5/11)+29/8`

`=5+29/8`

`=69/8`

`8,`

`(-1)/4 . 13 9/11-0,25 . 6 2/11`

`=(-1)/4 . 13 9/11-1/4 . 6 2/11`

`=(-1)/4 . (13 9/11+6 2/11)`

`=(-1)/4 . [(13+6)+(9/11+2/11)]`

`=(-1)/4 . (19+1)`

`=(-1)/4 . 20`

`=-5`

`9,`

`4/9 : (-1/7)+6 5/9+ : (-1/7)`

`=4/9 . (-7)+6 5/9 . (-7)`

`=(4/9+6 5/9) . (-7)`

`=(4/9+5/9+6) . (-7)`

`=(1+6) . (-7)`

`=7 . (-7)=-49`