(1.25)x5分之2-2³÷﹙-1又3分之1﹚²= 5/4 x 2/5 + 8 ÷ 16/9= 5/4 x 2/5 + 8 x 9/16= 1/2 + 9/2= 5 2分之3×[3÷﹙-3分之2﹚²－1四次方 = 3/2 x [3 x 4/9 - 1 ] = 3/2 x (4/3 -1 )= 3/2 x 1/3 = 2分...