Question

tính nhanh 2+4+8+16+32+64+128+256

Answer 1

Cho mình sửa lại xíu nhé:

2 + 4 + 16 + 32 + 64 + 128 + 256

=(2 + 128) + (4 + 16) + (8 + 32) + (64 + 256)

= 130 + 20 + 40 + 320 

=510

 

Answer 2

\(2+4+8+16+32+64+128+256\)

\(=\left(128+2\right)+\left(256+4\right)+\left(64+16\right)+\left(32+8\right)\)

\(=130+260+80+40\)

\(=390+120\)

\(=610\)

Answer 3

2 + 4 + 8 + 16 + 32 + 64 + 128 + 256

= (2 + 128) + (4 + 16) + (8 + 32) + (64 + 256)

= 200 + 20 + 40 + 320

= 580