(-3-1又二分之一)÷[3又四分之三÷(2-3又三分之一)×1又五分之一]
=(-9/2)÷[15/4÷(-4/3)×6/5]
=(-9/2)÷[15/4×(-3/4)×6/5]
=(-9/2)÷(-27/8)
=(-9/2)×(-8/27)
=4/3
[二十四分之一÷(-1又四分之一)]×(-六分之五)÷(-三又六分之一)-0.25÷四分之一
=[1/24×(-4/5)]×(-5/6)×(-6/19)-1/4*4
=(-1/30)×5/19-1
=-1/114-1
=-1又1/114
-3×[-5+(1-0.2÷五分之三)÷(-2)]
=-3×[-5+(1-1/5×5/3)×(-1/2)]
=-3×[-5+2/3×(-1/2)]
=-3×(-5-1/3)
=15+1
=16