Question

va rog ajutati-ma urgent

Answer 1

a)  ab + ac = ? ;    b + c = 50  si a = 2

a × ( b + c ) =  2 × 50 = 100

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b)   x y + x z + 15 ;   x = 9;   y + z = 11

= x ( y + z ) + 15 = 114

= 9 × 11 + 15 =

= 99 + 15 =

= 114

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c)   a b - a c ;   a = 7;  b - c = 100

= a × ( b - c ) =

= 7 × 100 =

= 700

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d)      5 x y + 5 x z + 21 ;   x = 4;  y + z = 100

= 5 x ( y + z ) + 21 =

= 5 × 4 × 100 + 21 =

= 2 000 + 21 =

= 2 021