OG详解-OG10 数学1 Q11

Choice B is correct. Applying the commutative property of multiplication, the expression (m⁴ q⁴ z^-1)(mq⁵ z³) can be rewritten as (m⁴ m)(q⁴ q⁵)(z^-1z³). For positive values of x, (x^a)(x^b) = x^a+b. Therefore, the expression (m⁴ m)(q⁴ q⁵)(z^-1z³) can be rewritten as (m⁴⁺¹)(q⁴⁺⁵)(z^-1+3), or m⁵ q⁹ z² .
Choice A is incorrect and may result from multiplying, not adding, the exponents. Choice C is incorrect and may result from conceptual or calculation errors. Choice D is incorrect and may result from conceptual or calculation errors.