-3/2×【1-3×(-2/3)²】-(1/4)²×(-2)³÷(3/4)³=-3/2×(1-3×4/9)-1/16×(-8)÷27/64。=-3/2×-1/3-(-1/2)×64/27.=1/2+32/27.=(27+64)/54.=91/54.
54分之91,约为1.69