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Answer:
1. 7/24 - 17/36
= (7/24×3/3) - (17/36×2/2)
= 21/72 - 34/72
= -13/72
2. 5/63 - (-6/21)
= 5/63 + 6/21
= 5/63 + (6/21×3/3)
= 5/63 + 18/63
= 23/63
ans.
CHECK IT OUT!!
1. 7/24 -17/36
=(21-34)/72
=-13/72
2. 5/63-(-6/21)
=5/63 +6/21
=23/63