网址:http://m.1010jiajiao.com/timu3_id_679960[举报]
(1)(6×1010)÷( )=-2×105; (2)( )·(-a2x2)=-5a;
(3)( )÷n=a-b+2c; (4)(3x3y2+x4y2-______)÷xy=_____+____-1.