(-2/3a^2bc^3)(-3/4c^5)^2×1/3(ab^2c^3)÷4/9abc^2
=-（2/3）(9/16)(1/3)(9/4)a^(2+1-1)b^(1+2-1)c^(3+25+3-2)
=-(9/32)a²b²c^29