38+23x98-37x23-15+23x38=?用简便计算(脱式)38+23x98-37x23-15+23x38=38+2254-852-15+874=2299
38+23x98-37x23-15+23x38=23×(98-37+38)+38-15=23×99+23=23×(99+1)=2300
38+23x98-37x23-15+23x38=(38-15)+23x(98-37+38)=23+23×99=23×(1+99)=23×100=2300