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1.a Commutative property for addition.
b Commutative property for multiplication.
2.a 1/2×3/4 = 3/8
3/4×1/2 = 3/8
b 1/2+3/4 = 10/8
3/4+1/2 = 10/8
3.-8/9×1/-5 = -8/-45
-8/-45+-8/-45 = 360+360/2025
= 720/2025.........1
1/-5+-7/11 = 35+11/-5×11
= 46/-55
-8/9×46/-55 = 720/2025..........2
1=2
Hence,proved
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