Question

Tính nhanh:

1875 + 1997 ++ (1825 - 1497)                378 x 64 + 189 x 132

Answer 1

1875+1997+(1825-1497)

=1875+1825+1997-1497

=2700+1500

=4200

378 x 64+189 x132

= (378+132)x (64+189)

=500 x (53+200)

=500 x53 +500 x 200

=26500+100000

126500