关于幂的乘方的计算题 越多越好

(-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________