9999×7778－3333×6666 的简便计算
问题描述：
9999×7778－3333×6666 的简便计算
答
26254586正确！9999×7778-(3333×3)×(6666÷3) =9999×7778-9999×2222 =9999×(7778-2222) =9999×5554 =5554×10000-5554 =55540000-5554 =55544446
答
9999x(7777+1)-3333x6666
=9999x7777+9999x1-3333x6666
=(1111x9)x(1111x7)+(1111x9)-(1111x3)x(1111x6)
=(1111x9)x(1111x7)-(1111x9)
=(1111x7-1)x(1111x9)
=7776x9999
=7776x10000-7776
=77760000-7776
=77752224
才对
答
9999×7778-(3333×3)×(6666÷3)
=9999×7778-9999×2222
=9999×(7778-2222)
=9999×5554
=5554×10000-5554
=55540000-5554
=55544446