12碼為978957678443
S= (9+8+5+6+8+4)*1+(7+9+7+7+4+3)*3
=40+111
=151
S=1xa1+3xa2+1xa3+3xa4+......+1xa11+3xa12
=1x(奇數位和)+3x(偶數位和)
=(9+8+5+6+8+4)+3(7+9+7+7+4+3)=40+3x37=151
S=1×9+3×7+...=1×(9+8+5+6+8+4)+3×(7+9+7+7+4+3)=40+111=151
S = (9+8+5+6+8+4)*1 + (7+9+7+7+4+3)*3 = 151
S=151
計算過程:
[(9+8+5+6+8+4)*1]+[(7+9+7+7+4+3)*3]=151
s=9+7*3+8+9*3+5+7*3+6+7*3+8+4*3+4+3*3=152
S=1x9+3x7+1x8+3x9+1x5+3x7+1x6+3x7+1x8+3x4+1x4+3x3=151
9+8x3+7x1+9x3+7x1+6x3+7x1+8x3+4x1+4x3+3x1=142