已知空气的单位体积质量是,将用科学记数法表示 . (保留2个有效数字)
若-a2b÷mab=2a,则m=_______.
(1)(6×1010)÷( )=-2×105; (2)( )·(-a2x2)=-5a;(3)( )÷n=a-b+2c; (4)(3x3y2+x4y2-______)÷xy=_____+____-1.
(8x2y-12x4y2)÷(-4xy)=________.
(a5b6-a3b2)÷ab=________;
3a2b2c÷(-a2b2)=________;