- 首页
- 消防工程师
答案:
-
1.)ry m- y= 0
-
2.B.-2yf(r,y)CyDf(ry)
-
3.(3) f(x, y,z)= ry y = l,x y z= 0.
-
4.B. df(x. y)d.C. dy. f(ry)dxD. dyf(r, y)d.
-
5.13、设y=y(x)满足y" 2y y=0,且y(0)=0,y(0)=1,则y(x)dx
-
6.(5) 2y" y=0,H0)=(0)=y(0)=0,'(0
-
7.m=5while(m==0): m-=1print(m)
-
8.A . 7x + y - 8=0 B . 7x - y + 8=0 C . 7x - y - 8=0 D . 7x + y + 8=0
-
9.RY
-
10.2(l y)/l2, 0 y lfY(y) 。0, 其 他