Toán Lớp 6: giúp mk với!!Mk hứa cho 5* !!
8^2 là 8 mũ 2 nha!!!
Tính hợp lí:
b/ 1 ×2 ×3… 9 – 1 ×2 ×3…8 – 1 ×2 ×3 …7 ×8^2
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Toán Lớp 6: giúp mk với!!Mk hứa cho 5* !!
8^2 là 8 mũ 2 nha!!!
Tính hợp lí:
b/ 1 ×2 ×3… 9 – 1 ×2 ×3…8 – 1 ×2 ×3 …7 ×8^2
Comments ( 2 )
$#Star$
$\text{b) 1 x 2 x 3 x … x 9 – 1 x 2 x 3 x … x 8 – 1 x 2 x 3 x … x $8^{2}$ }$$\\$ $\text{= 1 x 2 x 3 x … x 8 x (9 – 1 – 8 ) }$$\\$ $\text{= 1 x 2 x 3 x … x 8 x 0 }$$\\$ $\text{= 0 }$
1 ×2 ×3… 9 – 1 ×2 ×3…8 – 1 ×2 ×3 …7 ×8^2
=1 ×2 ×3… ×8 × 9 – 1 ×2 ×3… ×8 ×1 – 1 ×2 ×3 … ×8times8
=1 ×2 ×3… ×8 ×(9-1-8)
=1 ×2 ×3… ×8 ×0
=0