简便计算:899998-799999+89998-79999+8998-7999+898-799+88-79

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/08 20:24:14
简便计算:899998-799999+89998-79999+8998-7999+898-799+88-79

简便计算:899998-799999+89998-79999+8998-7999+898-799+88-79
简便计算:899998-799999+89998-79999+8998-7999+898-799+88-79

简便计算:899998-799999+89998-79999+8998-7999+898-799+88-79
899998-799999+89998-79999+8998-7999+898-799+88-79
=(900000-800000+90000-80000+9000-8000+900-800+90-80)-5
=111110-5
=111105

899998-799999+89998-79999+8998-7999+898-799+88-79
=(899998+1)-(799999+1)+........
=899999-800000+....
=99999+9999+999+99+9
=99999+1-1+9999+1-1...
=100000-1+10000-1+..
=111110-5
=111105

899998-799999+89998-79999+8998-7999+898-799+88-79
=99998+(800000-799999)+9998+(80000-79999)+998+(8000-7999)+98+(800-799)+8+(80-79)
=99998+1+9998+1+998+1+98+1+8+1
=99999+9999+999+99+9
=100000-1+10000-1+1000-1+100-1-10-1=111110-5=111105

899998-799999+89998-79999+8998-7999+898-799+88-79
=900000-2-800000+1+90000-2-80000+1....
=100000-1+10000-1+1000-1+100-1+10-1
=111110-5
=111105