21
21
21
8x +
4 - 3x2 -
6x -
3
3
4h -
4 =
3- +
6
3 t + 10
42 =
3xy 5
=
x 19
3y
= - +
2x +
11 =
27 x =
x
=
8 2x -
x +
19 =
25
76
40
76 +
40
=
116
3
+
x +
x +
3
1 +
=
x
x2
+
2
1
=
x2 - 1
3 )16
o e
x
=
-
2
2
x -
3x
-
L =
x =
3t5 =
4 or -
12a x =
42
ax
=
-
3k =
15
k
=
I
1
x
2
+
6x -
7 =
0
=8
- 6 =
/36 + 28
X =
=
/or -
7
2
2x
。
y
=
(x +
2 -
3 =
59 +
c = -
1
b
y 3x
= +
3 15 b
-
= +
b =
-
18
⼀
v (z(r)
=
r
v = cr2
=
Cr =
=
c =
2
.
5
15
64x =
4 =
16x
1 .
38 r =
4 4 +
4 =
8
S
=
r 2
=
300x
=
300 -
y
y
-
x +
3r -
4(r -
2)
=
8 3575 ! 15x +
10y(3600
3r 4r 8 8 10 4500 157 10 y
15(300 y) y
= - +
- + = +
-
r =
0 3575 = 4500 -
57 =3600
925[ = 900
5y
-
- -
y
=
180 = 185
183
60 46
xp
=
p = 77
35