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ab = 22
= + + 3ab( a + b )
1000 = + + 3 x 22 x 10
1000 = + +´660
1000 - 660 = +
340 = +
2. a + b = 5
[/tex] (a + b)^{2} [/tex] = 21
= (a + b)( a^2 + ab + b^2 ) (PRODUCTO NOTABLE : SUMA DE CUBOS)
= ( 5 ) (a-b)^2
= ( 5 ) ( 21 )
= 105
Disculpa, la tres no la puedo resolver u.u