Question

tính nhanh [ 146 + 287 + 158 ] + [ 187 + 158 + 546 ]

Answer 1

=146+287+158+187+158+546

=692+474+316

=1482

Answer 2

= 146 + 287 + 158 + 187 + 158 + 546
= 100 + 46 + 200 + 87 + 100 + 58 + 100 +87 +100 +58 +500 + 46
=(100+200+100+100+100+500) + (46+46+87+87+ 58+58)
=1100 + 2 x (46 + 87 + 58)
=1100 + 2 x (190 +1)
=1100 + 2 x 190 + 2
=1100 + 380 + 2
=1482