""
.
:
1 -
2 - :
.
3 -
1,2 . ( , 793 93 2 : 1 14, 2 3, 3 7.)
(, , ).
1
2
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- , , , (), , , , .
- . :
1.
2.
3.
4.
5.
- .
- .
00
, X,Y , = 0, = 0, y = 1 - x,
y
y = 1 - x
1 x
0
1.
:
X, Y ,
:
.
Δ .
2.
1. (X,Y), , :
0<=X<=1
0<=Y<=1-X
2. , (X,Y):
F = 0 <= X <= 1 and 0 <= Y <= 1-X
3.
() 19.701 90:
4. BASIC
REM
CLS
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INPUT (X,Y), X,Y
LET F = X >= 0 AND X <= 1 AND Y >= 0 AND Y <= 1-X
IF F THEN
ELSE
PRINT Δ
END IF
END