53x57-47x43
=53x(47+10)-47x(53-10)
=53x47+53x10-53x47+47x10
=53x10+47x10
=(53+47)10
=100x10
=1000
希望对你有帮助!
53乘57减47乘43
=53x(47+10)-47x(53-10)
=53x10+47x10
=100x10
=1000
53*57-47*43
=53*(47+10)-47*(53-10)
=53*47+53*10-53*47+47*10
=53*10+47*10
=(53+47)10
=100*10
=1000
53*57-47*43
=(43+10)57-(57-10)43
=43*57+10*57-43*57+10*43
=10*57+10*43
=10(57+43)
=10*100
=1000