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First take two rational no.s example -4/5 and 3/10

then take l.c.m = ]-8/10 and 3/10 [l.c.m. =10]

now add these =]-8+3/10

now divide by 2 =]-5/10÷2

now its answer = ] -5/20

if you want more continue ] -5/20 + 3/10 ÷ 2

then take l.c.m = ]-8/10 and 3/10 [l.c.m. =10]

now add these =]-8+3/10

now divide by 2 =]-5/10÷2

now its answer = ] -5/20

if you want more continue ] -5/20 + 3/10 ÷ 2