4+9+8+6+2+1+3+7 = (4+6) + ( 9+1) + ( 8+2 ) + (7+3)
= 10 + 10 + 10 +10
= 40
4 + 9 + 8 + 6 + 2 + 1 + 3 + 7 = ( 4 + 6 ) + ( 9 + 1 ) + ( 8 + 2 ) + ( 3 + 7 )
= 10 + 10 + 10 + 10
= 10 x 4
= 40
= (4+6) +(9+1)+(8+2)+(3+7)
=10+10+10+10
=10x4
=40
k nhé
\(4+9+8+6+2+1+3+7\)
\(=\left(4+6\right)+\left(9+1\right)+\left(8+2\right)+\left(3+7\right)\)
\(=10+10+10+10\)
\(=10\times4\)
\(=40\)
\(4+9+8+6+2+1+3+7\)
\(=\left(4+6\right)+\left(9+1\right)+\left(8+2\right)+\left(3+7\right)\)
\(=10+10+10+10\)
\(=10\times4\)
\(=40\)