a ) ( 7 x 9 )²²³ : ( 7²²² x 9²²¹ ) = 567
= 63²²³ : ( 7 ²²¹ x 7 x 9²²¹ ) =
= 63²²³ : ( 7 x 9 )²²¹ x 7 =
= 63² x 63²²¹ : 63²²¹ x 7=
= 63 x 63 : 7 =
= 63 x 9 =
= 567
