原容积为 a^2 *10 = 10a^2
增加5厘米后:(a+5)^2 *10 = (a^ +10a + 25) *10 = 10a^2 +100a +250
容器增加的体积V = 10a^2 +100a +250 - 10a^2 = 100a +250
(2) 10* 5^2 = 250 平方厘米
原容积为 a^2 *10 = 10a^2
增加5厘米后:(a+5)^2 *10 = (a^ +10a + 25) *10 = 10a^2 +100a +250
容器增加的体积V = 10a^2 +100a +250 - 10a^2 = 100a +250
(2) 10* 5^2 = 250 平方厘米