Efectuati:(1991×1992+1992×1993+1993×1994)×(64×105-24×35-49×120)

Răspuns :

(1991×1992+1992×1993+1993×1994)×(64×105-24×35-49×120)=
=》(3 966 072+3 970 056 + 3 974 042)×(6720-840-5880)=
=》(7 936 128 + 3 974 042 )×(5880-5880)=
=》11 910 170×0=
=》0