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3 3/4+2 2/3x2 1/4=15/4+8/3x9/4=15/4+8x3/4=15/4+24/4=39/4=9 3/4
[(1 1/2)²+1 1/6]x3=[(3/2)²+7/6]x3=[9/4+7/6]x3=[27/12+14/12]x3= 41/12x3= 123/12= 10 3/12
c)
2 2/5x1 2/3-1 5/6=12/5x5/3-11/6=4-11/6=24/6-11/6=13/6=2 1/6
4 7/8-1 1/3x1 1/8=4 7/8-4/3x9/8=39/8-4x3/8=39/8-12/8=27/8=3 3/8