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daca x= 5 si a+b=13calculati:10×x +(4×a+4×b); si (4×a+4×b-2 ×x) × (2×a+2×b+ x)

Răspuns :

Cocirmariadenis

x = 5   si a + b = 13

10 ×  x + 4 × ( a + b ) = 10 × 5 + 4 × 13 = 50 + 52 = 102

( 4 × a + 4 × b - 2 × x ) × ( 2 × a + 2 × b + x ) = 1 302

=  [ 4 × ( a + b ) - 2 × 5 ] × [ 2 × ( a + b ) + 5 ] =

= ( 4 × 13 - 10 ) × ( 2 × 13 + 5 ) =

= ( 52 - 10 ) × ( 26 + 5 ) =

= 42 × 31 =

= 1 302

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