Question

Daca x=15 si a+b = 14 calculati (4a + 4b -3x) ori (3a+3b+3x)

Answer 1

Răspuns:

4a+4b-3x=4(a+b)-3x=4*14-3*15=56-45=11

3a+3b+3x=3[(a+b)+x]=3(14+15)=3*29=87

11*87=957

Explicație pas cu pas:

Answer 2

Răspuns:

Explicație pas cu pas:

( 4 a + 4 b - 3 x ) × ( 3 a + 3 b + 3 x ) = 957

=[ 4 × ( a + b ) - 3 × 15 ] × 3 × ( a + b + x ) =

= ( 4 × 14 - 45 ) × 3 × ( 14 + 15 ) =

= ( 56 - 45 ) × 3 × 29 =

= 11 × 87 =

= 957