B Minus dA / dt is all the ways that I destroy and create B, A so there's a k1 times A minus k minus one times B. 负的dA/dt是我以各种方式消耗的和生成的,所以有k1乘以。
And now, after rearranging your differential equation, putting B in there, k you can rewrite this as k1 plus k minus one times A A0 minus k minus one times B0 plus A0. 现在,在重新整理你的微分方程后,把B放进这儿,你可以重新把它写作k1加,负1乘以A减k负1乘以B0加。
Some lower boundary for interest rates surely exists. But it is minus 1 or minus 2 per cent, not zero. 更低的利率分界线肯定存在,但那是-1%或-2%,而不是零。
SdT This has minus T dS minus S dT, but the dT part is zero because we're at constant temperature. 这一项包含负的Tds和,但是dT的部分等于零,因为温度为常数。
One minus e to the minus k1 times the time. 1减e的负k1乘以时间次方。