a.(4568+3759)-(4563+3764)
= 4568+3759-4563-3764
=(4568-4563)+(3759-3764)
=5+(-5)
=0
b.(56*27+56*35):62
=56*27+56*35:62
=56*(27+35):62
=56*62:62
=56*(62:62)
=56*1
=56
a (4568+3759)-(4563+3764)
=(4568-4563)+(3764-3759)
= 5+5=10
b (56x27+56x35):62
=56x(27+35):62
=56x62:62
=56