simplify (1) -3/10+12/-10+14/10
(2) -5/10+9/7+3/20+-11/14
(3) 5/36+-78+6/-72+-3/-12
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1.-3/10+(-12/10)+14/10
=-3/10-12/10+14/10
=15-14/10(as denominators are same we can add)
=1/10
2.-5/10+9/7+3/20+(-11/14)
=-5/10+9/7+3/20-11/14
do lcm for 10,7 20,14 then u will get 140
=-70+180+21-11/140
=201-81/140
=120/140
=30/35
3.5/36+(-78) +(_6/72)+(-3/12)
=5/36-78-6/72-3/12
do lcm for 36,72,12 then u will get 288
=40-2808-24-24/288
=-2760+40/288
=2720/288
=2, 759.86111
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