a)(a – b + c) – (a + c) = -b
b) (a + b) – (b – a) + c = 2a + c
c)- (a + b – c) + (a – b – c) = -2b
d)a(b + c) – a(b + d) = a(c – d)
e)a(b – c) + a(d + c) = a(b + d)
f) a.(b – c) – a.(b + d) = -a.( c + d)
h) (a + b).( c + d) – (a + d).( b + c) = (a – c). (d – b)
Loga
Sinh Học lớp 12
