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a fost răspuns

Adevarat sau fals?
a) 7 x ( a + 5) = 7  x a + 5
b) 3 x ( a + b ) = 3 x a + 24
c) (a + 1 + b) x 35 = 35 x a + 35 + 35 x b 
d) ( a + 1 ) x 5 = 5 x a + 1
e) (a + 1) X 5 = a X 5
f) 5 X ( a + 1) = 5 X a + 5