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3ˣ² = 81
ˣ² = ( 81:3= 27:3= 9:3= 3:3=1)
ˣ² = 4
ˣ = √4
ˣ = 2
2. 4 x 3/4+ 5 x 3/4 = 4 3/4 + 5 3/4
= 9 6/4
= 10 2/4
= 10 1/2