Question

1.（-X）的8次方-（-3X的4次方）的2次方+8盛[-（-X）的4次方的]2次方 2.2乘（-XY的）9次方乘Y的3

Answer 1

(-x)^8-(3x^4)^2-8*[-(-x)^4]^2

=x^8-9x^8-8*(-x)^8

=x^8-9x^8-8x^8

=(1-9-8)x^8

=-16x^8

2*(-xy)^9*y^3

=-2x^9*y^9*y^3

=-2x^9y^12

[4*(x-y)]^2

=16(x-y)^2

=16x^2-32xy+16y^2

[-a^(n+1)]^2*(-a^3)^(2n-1)

=-a^(2n+2)*a^(6n-3)

=-a^(2n+2+6n-3)

=-a^(8n-1)