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Commutative property of rational numbers is= a*b = b*a or a+b= b+a where a and b are rational numbers. so we have the given numbers a= -3/4 and b=4/9 and we have to check whether this property holds or not in multiplication. so in L.H.S= a*b = -3/4 *4/9 = -12/36= -1/3 in R.H.S = b*a = 4/9* -3/4 =-12/36= -1/3 as -1/3= -1/3 ∴ L.H.S= R.H.S verified..