1
1
1) A=
x(x+1)
(x+1)(x+2) (x+2)(x+3)
(x+1)(x+2) (x+2)(x+3)
2) A =
1
3) A =
+
1
1
1
1
(a-b)(a-c) (b-c)(b-a) (c-a)(c-b)
x-2-3
3
(x-1)(x-2) (x-2)(x-3) (x-3)(x-1)
1
1
4) A=
+
+ +
a²+a a²+3a+2
a²+19a+90
4.(x+3)²
x²-25
5) A =
(2x+3)²-x²
(3x+5)²-4x² 9x²-(2x+5)² (4x+15)².
-X
a²
b²
c²
6) A=
+ ...
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