1. if A2m- 1am+2 = A7, the' value of m is ().

A.2 B.3 C.4D.5

2, the following calculation error is ().

A.(-2x)3=-2x3 B.-a2a=-a3C。 (-x)9+(-x)9=-2x9D。 (-2a3)2=4a6

3. The following is a classmate's homework:

○ 13a+2b = 5ab○24m3n-5mn 3 =-m3n○3○44a 3b \(-2a2b)=-2a○5(a3)2 = a5○6(-a)3 \(-a)=-a2

The correct number is ()

a、 1B、2C、3D、4

4. If (2x- 1) 0 = 1, then ().

A.x≥ B.x≠C.x≤D.x≠

5. If (+m) (x-8) does not contain the linear term of x, the value of m is ().

A, 8 B, -8c, 0 D, 8 or -8