5.42-(3.75-0.58
=5.42+0.58-3.75
=6-3.75
=2.25那1998÷1998又1999分之1998怎么算呢?1998÷1998又1999分之1998=1998÷1999分之(1998×1999+1998)=1998×【1998×2000分之1999】=2000分之1999五分之四×7.7+3.3×0.8-五分之四简算最后一题五分之四×7.7+3.3×0.8-五分之四=0.8×(7.7+3.3-1)=0.8×10=8
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