主要内容

积分学

课程 1: 微分方程介绍

编写微分方程

每个月哈珀的贷款余额, B, 以 0, point, 22, percent 增加并且减少dollar sign, 250, point, 00.

哪个式子表示了这种关系?

(选择 A)
B, left parenthesis, t, right parenthesis, equals, 0, point, 0022, B, minus, 250
(选择 B)
start fraction, d, B, divided by, d, t, end fraction, equals, 0, point, 0022, B, minus, 250
(选择 C)
B, left parenthesis, t, right parenthesis, equals, 0, point, 0022, left parenthesis, B, minus, 250, right parenthesis
(选择 D)
start fraction, d, B, divided by, d, t, end fraction, equals, 0, point, 0022, left parenthesis, B, minus, 250, right parenthesis

不会做了？