例2和练习2的1,
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例2和练习2的1,
例2和练习2的1,
例2和练习2的1,
(1)(5.6*3+6.9*4+8.4*2)/9=. (2)48*85.5=4104 23*86.5=1989.5 (4104-1989.5)/25=.