45×53+55×55简便计算脱式计算简便计算:6946÷23 9801÷99 999999×999996
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45×53+55×55简便计算脱式计算简便计算:6946÷23 9801÷99 999999×999996
45×53+55×55简便计算
脱式计算
简便计算:6946÷23 9801÷99 999999×999996
45×53+55×55简便计算脱式计算简便计算:6946÷23 9801÷99 999999×999996
(1)
45×53+55×55
=45×(55-2)+55×55
=45×55+55×55-45×2
=55×(45+55)-90
=5500-90
=5410
(2)
6946÷23
=(6900+46)÷23
=6900÷23+46÷23
=300+2
=302
(3)
9801÷99
=(9900-99)÷99
=9900÷99-99÷99
=100-1
=99
(4)
999999×999996
=(1000000-1)×999996
=999996000000-999996
=999995000004