第86页

信息发布者:
②
③
②
③





①
=720÷(45×2)
=720÷90
=8
=720÷9÷2
=80÷2
=40
=560÷70÷2
=8÷2
=4
=185-78
=107
=400÷100
=4
=72÷(960÷80)
=72÷12
=6