cái giề mà cứ cj Linh hoài z :)

`1/5 x : 3 = 2/3 : 0,25`

`1/5 x : 3 = 2/3 : 1/4`

`1/5 x : 3 = 8/3`

`1/5 x=  8/3 xx 3`

`1/5 x = (8xx3)/(3xx1)`

`1/5 x = 8`

`x = 8 : 1/5`

`x = 8 xx 5`

`x = 40`

`(-22)/15 x + 1/3 = | -2/3 + 1/5|`

`(-22)/15 x + 1/3 = 7/15`

`(-22)/15 x = 7/15 - 1/3`

`(-22)/15 x= 2/15`

`x = 2/15 : (-22)/15`

`x = 2/15 xx (-15)/22`

`x= (-1)/11`

`5/7 + 2/3x = 3/19`

`2/3x= 3/10 - 5/7`

`2/3x = (-29)/70`

`x= (-29)/70 : 2/3`

`x= (-87)/140`

`(1+3+3+....+2011) xx ( 125125 xx 127 - 127127 xx 125)`

`= (1+3+3+....+2011) xx ( 15890875 - 15890875)`

` = (1+3+3+....+2011) xx 0`

` = 0`

`(-1 1/5 + x) : (-3 3/5) = (-7)/4 + 1/4 : 1/8`

`(-1 1/5 + x) : (-3 3/5) = (-7)/4 + 1/4 xx 8`

`(-1 1/5 + x) : (-3 3/5) = (-7)/4 + 2`

`(-1 1/5 + x) : (-3 3/5) = 1/4`

`((-6)/5 +x) : (-18)/5 = 1/4`

`(-6)/5 + x = 1/4 xx (-18)/5`

`(-6)/5 + x = (-9)/10`

`x=(-9)/10 - (-6)/5`

`x=3/10`