www.9647.net > 用简便方法计算11111*99999+99999*77777

用简便方法计算11111*99999+99999*77777

11111*99999+99999*77777=99999x(11111+77777)=99999x88888=(100000-1)x88888 =8888800000-88888=8888711112

11111*99999=11111*(100000-1)=11111*100000-11111=1111100000-11111=1111088889

99999*7+77777*5+22222=11111*63+11111*36+11111*2=11111*(63+35+2)=11111*100=1111100

55555*99999÷(33333+77777)=55555*(100000-1)÷111110=55555*(100000-1)÷11111÷10=55555÷11111*(100000-1)÷10=5*(100000-1)÷10=0.5*(100000-1)=50000-0.5=49999.5

11111x99999+99999x6666=11111x99999x(1+6)=77777x99999=77777x(100000-1)=7777700000-77777=7777622223

99999*11111 =(100000-1)*11111 =100000*11111-1*11111 =1111100000-11111 =111088889

简便计算11111*9999911111*99999=11111*(100000-1)=1111100000-11111=1111088889

99999^2+99999=99999^2+2*99999+1-99999-1 =(99999+1)^2-100000 =10000000000-100000 =9999900000

=99999*(22222+33333)=99999*55555=(100000-1)*55555=5555500000-55555=5555444445

原式=8888x99999÷1111÷11111=(8888÷1111)x(99999÷11111)=8x9=72 供参考.

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