1276 x 1555 + 1666 x 1276 - 1276
= 1276 x (1555 + 1666 - 1)
= 1276 x 3220
= 4108720
k mik nha Nguyễn Thị Thùy Dung
1276x1555+1666x1276-1276x1
= 1276x(1555+1666-1)
=1276x3220
=4108720
1276*1555+1666*1276-1276
=(1276*1555)+(1666*1276)-1276
=1984180+2125816-1276
=4109996-1276
=4108720