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Aplica regulile invatate pentru a calcula mai usor
a)2x36+2x84+2x43;
b)6x34+6x47+6x82
c)9x127-9x74.

2)Calculeaza,respectand ordinea operatiilor
87+3x25;
64-2x13;
827-4x128;
706-3x87;
214+315x2;
635-218x2.


Răspuns :

1
a)2x(36+84+43)=
2x163=326
b)6x(34+47+82)=
6x163=978
c)9x(127-74)
9x53=477
2
87+3x25=
87+75=162
64-2x13=
64-26=38
827-4x128=
827-512=315
706-3x87=
706-261=445
214+315x2=
214+630=844
635-218x2=
635-436=199