题:10x+90=29010x=290-90x=200/10x=20题:10x+91=29110x=291-91x=200/10x=20题:10x+92=29210x=292-92x=200/10x=20题:10x+93=29310x=293-93x=200/10x=20题:10x+94=29410x=294-94x=200/10x=20题:10x+95=29510x=295-95x=200/10x=20题:10x+96=29610x=296-96x=200/10x=20题:10x+97=29710x=297-97x=200/10x=20题:10x+98=29810x=298-98x=200/10x=20题:10x+99=29910x=299-99x=200/10x=20题:10x+90=30010x=300-90x=210/10x=21题:10x+91=30110x=301-91x=210/10x=21题:10x+92=30210x=302-92x=210/10x=21题:10x+93=30310x=303-93x=210/10x=21题:10x+94=30410x=304-94x=210/10x=21题:10x+95=30510x=305-95x=210/10x=21题:10x+96=30610x=306-96x=210/10x=21题:10x+97=30710x=307-97x=210/10x=21题:10x+98=30810x=308-98x=210/10x=21题:10x+99=30910x=309-99x=210/10x=21题:10x+90=31010x=310-90x=220/10x=22题:10x+91=31110x=311-91x=220/10x=22题:10x+92=31210x=312-92x=220/10x=22题:10x+93=31310x=31