10又2/9-(1又4/5+2.5)
=10又2/9-(1又4/5+2又1/2)
=10又2/9-4又3/10
=5又83/90
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和
(92/9)--(9/5)+2.5
解,得:
==(460/45)-(81/45)+(5/2)
==(379/45)+(5/2)
==(758/90)+(225/90)
==983/90
差
(92/9)--(9/5)-2.5
解,得:
==(379/45)-(5/2)
==(758/90)-(225/90)
==533/90
10.22-(1.8+2.5)=10.22-4.3=5.92