作业帮就三题计算题,
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就三题计算题,
就三题计算题,
就三题计算题,
1997÷(1997+1997/1998)+1÷1999
=1997÷[1997(1+1/1998)]+1/1999
=1997÷(1997×1999/1998)+1/1999
=1998/1999+1/1999
=1
1/1*4+1/4*7+...+1/97*100
=1/3[(1-1/4)+(1/4-1/7)+...+(1/97-1/100)]
=1/3(1-1/100)
=1/3*99/100
=33/100
(4.8-0.75)÷[(5/4+5/6)×0.36]
=4.05÷(5/4*0.36+5/6*0.36)
=4.05÷(0.45+0.3)
=4.05÷0.75
=5.4
第一题 =1 第三题 27/5 第二题看不懂