for a:=1 to 9 do begin matrix[1] := a + 2; for b:=1 to 9 do begin matrix[2] := b + 2; for c:=1 to 9 do begin matrix[3] := c + 2; for d:=1 to 9 do begin matrix[4] := d + 2; for e:=1 to 9 do begin matrix[5] := e + 2; for f:=1 to 9 do begin matrix[6] := f + 2; for g:=1 to 9 do begin matrix[7] := g + 2; for h:=1 to 9 do begin matrix[8] := h + 2; for i:=1 to 9 do begin matrix[9] := i + 2;
for a:=1 to 9 do begin matrix[1] := a + 2; for b:=1 to 9 do begin matrix[2] := b + 2; for c:=1 to 9 do begin matrix[3] := c + 2; for d:=1 to 9 do begin matrix[4] := d + 2; for e:=1 to 9 do begin matrix[5] := e + 2; for f:=1 to 9 do begin matrix[6] := f + 2; for g:=1 to 9 do begin matrix[7] := g + 2; for h:=1 to 9 do begin matrix[8] := h + 2; for i:=1 to 9 do begin matrix[9] := i + 2;
1) -2,4m*(-3n) = 7,2mn
2) -8a-12b+5a-17b = - 8a+5a + (-12b) - 17b = - 3a - 29b
3) a-(a+5)+(-7+a)= a - a- 5 - 7 +a = a - 12
4) - 5(y-4)+(y-5) = - 5y+20 +y - 5 =
-4y+15