已知xn=2,yn=3,则(x2y)2n=_______. 若(9m+1)2=316,则正整数m的值为_____.
若an=5,bn=3,则(ab)n=____;若2m=15,3m=20,则6m=__________.
计算:(-3mn)3=______;(a2b)2·(ab2)3=______;(xy)7·(-xy3)3=______.
若2x+1·3x+1=62x-1,则x的值为_______,若x2n=4,则(3x3n)2=______,计算0.042020×(52021)2=______.
计算:(2b)3=_______.-(-3a3)2·(a2)3=________.
计算0.256×(-32)2等于( )
A. - B. C. 1 D. -1