(-x的3次方y的4次方)的4次方=___x^12y^16___________
2(a²·b的4次方)²=______2a^4b^8________
(2分之1xy²z的3次方)的4次方=______(1/16)x^4y^8z^12________
[-3分之1(x-y)²·a的3次方b]的4次方=______(1/81)(x-y)^4a^12b^4________