Question

计算：-2x的4次乘x的3次乘（-x）的7次+（-x的2次）的7次-2（-x的3次）的4次乘x的2次.

Answer 1

-2x^4*x^3*(-x)^7+(-x^2)^7-(-x^3)^4*x^2

=2x^(4+3+7)-x^14-x^(12)*x^2

=2x^(14)-x^14-x^14

=0