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A.x≥2                                                          B.x≤－2

C.x≤－2或x≥2                                             D.x∈R

A.－a一定是負(fù)數(shù)                                           B.若a<0，則=－a

C.若a<0，則|a²|=－a²                                D.a<0時, =1

計(jì)算填空:=________，=________，()³=________，

()⁴=________，=________.

A.x²－5x+6≥0                                                B.x≥3

C.x≤2                                                            D.x≥2

A.a^m·aⁿ=a^mn                                                                            B.(a^m)ⁿ=a^m+n

C.(a^mbⁿ)=(ab)^m+n                                                                      D.()^m=a^-mb^m

①=0(n∈N^*且n>1)；②()ⁿ=a(n∈N^*且n>1)；③=a(n為大于1的奇數(shù))；    

 ④=|a|=(n為不等于零的偶數(shù)).

A.1                                                                 B.2

C.3                                                                 D.4

A.a⁰=1                                                            B.a^－n=a(n∈N^*)

C.a^m·aⁿ=a^m+n                                              D.(a^m)ⁿ=a^m+n

(1)；

(2).