题目已知x+y−3=0x+y-3=0x+y−3=0,则2x⋅2y2^{x}\cdot 2^{y}2x⋅2y的值是（ ）A.666B.−6-6−6C.18\dfrac{1}{8}81D.888知识点：代数式求值;同底数幂的乘法章节：未标注
