Question

同底数幂的乘法不会用电脑写次方只好打字 请谅解 （1）.（-X）的二次方*X的三次方+2X的三次方*（-x）的二次方-X

Answer 1

(-X)^2*X^3+2X^3*(-X)^2-X*X^4

=X^5+2X^5-X^5

=2X^5

X*X^(M-1)+X^2*X^(M-2)-3X^3*X^(M-3)

=X^M+X^M-3X^M

=-X^M