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-8m3+12m2-4m=-4m(2m2+3m-1) m2+5n-mn-5m=(m-5)(m-n) 5m2+6mn-8n2=(m+2n)(5m-4n) 0.04a2+0.12ab+0.09b2=(0.2a+0.3b)2
M.∩N.={4,6} M.∪N.=U. (UN)∪M.=U. (UM)∩N.=N.
∅ {1,4,5} {1,2,3,4,5} {2,3}
{1,2,3}∪{4,5,6} {5,5,6,6,7,7,8,8,9,9} {5,6,7,8,9} {5,7,9}
{5} {0,3} {0,2,3,5} {0,1,3,4,5}
m﹣2>n﹣2 m﹣5<n﹣5 ﹣2m>﹣2n 4m<4n
(2,﹣3) (﹣2,3) (2,3) (﹣2,﹣3)
m=2,n=4 m=3,n=4 m=2,n=5 m=2,n=3
int a[2][ ]={ {1,0,1},{5,2,3}; int a[ ][3]={ {1,2,3},{4,5,6}; int a[2][4]={ {l,2,3},{4,5},{6} }; int a[ ][3]={ {1,0,1},{ },{l,1} };
{1,2,3} {1,3,5} {1,4,5} {2,3,4}
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