题目内容
①x+598=3s6
②x-598=3s6
③3s6-x=598．
②x-598=3s6
③3s6-x=598．
（a）x+a98=574
&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm; x=574-a98，
&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm; x=a78；
（2）x-a98=574
&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm; x=574+a98，
&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm; x=57d；
（5）574-x=a98
&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm; x=574-a98，
&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm; x=a78．
&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm; x=574-a98，
&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm; x=a78；
（2）x-a98=574
&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm; x=574+a98，
&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm; x=57d；
（5）574-x=a98
&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm; x=574-a98，
&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm;&nbsm; x=a78．
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