（1）10的2a次方+10的3b次方的值.
=(10的a次方)²+(10的b次方)³
=5²+6³
=25+216
=241
（2）10的2a+3b次方的值
=(10的a次方)²×(10的b次方)³
=5²×6³
=25×216
=5400