73.3-4.46=(計算並驗算)
68.84,多算幾遍就行了!
計算:2(3+1)(3^2+1)(3^4+1).(3^16+1)+1
2(3+1)(3^2+1)(3^4+1).(3^16+1)+1
=(3-1)(3+1)(3^2+1)(3^4+1).(3^16+1)+1
=(3^2-1)(3^2+1)(3^4+1).(3^16+1)+1
=(3^4-1)(3^4+1).(3^16+1)+1
反復用平方差
=3^32-1+1
=3^32
(x+1.7)#3=1.4的驗算?
如果後面是乘以3的話,計算方法是
X=1.4/3-1.7
X=-1.23