Điền vào chỗ trống
a) ( ...... + ......) ( 9x3 - ...... + 1 ) = ( .......)3 + (.....)3
b) ( x + .......) ( ...... - ......+ 16) = ( .....)3 + (.....)3
c) ( ......+.....) ( 25x2 - 10x + ....) = (.....)3 + (.....)3
d) (...... + .....) ( ..... - 6x + 9 ) = ( ....)3 + (.....)3
e) (...... + ....) (.... - 12x + .....) = (.....)3 + (....)3