求64+98+302-64的简便计算

问题描述:

求64+98+302-64的简便计算

64+98+302-64=64-64+100-2+300+2=100+300=400

64+98+302-64
=64-64+98+302
=0+400
=400

64+98+302-64
=(98+302)+(64-64)
=400+0
=400

64+98+302-64
=64-64+98+302
=98+302
=400