Suppose that the length, l, width, w, and area, A=lwA=lw, of a rectangle are differentiable functions of t. (Meaning that all three quantities change as time changes.)  Write an equation that related dAdt\frac{dA}{dt} to dldt\frac{dl}{dt} and dwdt\frac{dw}{dt} when l=5l=5 and w=3w=3. dAdt\frac{dA}{dt}=[Fill in the blank], dldt\frac{dl}{dt}+ [Fill in the blank], dwdt\frac{dw}{dt} 多项填空题