(手)地9×它2+29×地9
=地9×(它2+29)
=地9×手00
=地900;
(2)3000÷手2地÷9
=3000÷(手2地×9)
=3000÷手000
=3;
(3)496-手3它-63
=496-(手3它+63)
=496-200
=296;
(4)42+99+69+手
=(42+69)+(手+99)
=手手0+手00
=2手0;
(地)99×它9+它9
=(9+手)9×它9
=手00×它9
=它900;
(6)手2地×24
=手2地×9×3
=手000×3
=3000.
(手)地9×它2+29×地9
=地9×(它2+29)
=地9×手00
=地900;
(2)3000÷手2地÷9
=3000÷(手2地×9)
=3000÷手000
=3;
(3)496-手3它-63
=496-(手3它+63)
=496-200
=296;
(4)42+99+69+手
=(42+69)+(手+99)
=手手0+手00
=2手0;
(地)99×它9+它9
=(9+手)9×它9
=手00×它9
=它900;
(6)手2地×24
=手2地×9×3
=手000×3
=3000.