18: :
S - ; P- - , ճ- - , V - , n - .
-31 45 :
a | b | c | d | f |
1-3. 1, 2, 3 : .., .., - .. Microsoft l : . : "", 2010. 95 .(.419).
4: y , : a=16; b=-6; c=25,34; k=5; d=8,1234; p=2,45×102; x .
45 | x=b x=c; x<b; . |
: 45
: 5 , 60% 6 6 , 5 , 8 80%, 8 6 6 . , 7, 8, 4, 12 ; 6 1302 ., 1350 ., 1200 ., 1400 .; 6 129, 120, 122, 125; 6, 10, 12, 8.
6: :
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7: : 21. , . B . 䒺 . 20 40, B 䒺 , B . , , 10 25.
8: : 2.6. : ) ; ) :
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x1 | +x2 | -3x3 | =-2 | |
2x1 | -x2 | +4x3 | =5 | |
3x1 | +x2 | -x3 | =0 |