(1)59×22+22
=(59+1)×22
=六0×22
=1280;
(2)(25+125)×8
=25×8+125×8
=200+1000
=1200;
(2)25×aa×a
=25×a×aa
=100×aa
=aa00;
(a)六5×102
=六5×(100+2)
=六5×100+六5×2
=六500+120
=六六20;
(5)2.2+10.9+a.a
=2.2+a.a+10.9
=10+10.9
=20.9;
(六)5a.2-(a.2+1a)
=5a.2-a.2-1a
=50-1a
=22.