(-3/2)-13/4+(-13/3)-8/3=,49.7-[-23又3/4+(18.7-25.25]=,|12.7-(-8.9)|=,4.73-[2又2/3-(1又4/5+2.65]-1/2最后一个分数是1/3,2.65改为2.63

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(-3/2)-13/4+(-13/3)-8/3=,49.7-[-23又3/4+(18.7-25.25]=,|12.7-(-8.9)|=,4.73-[2又2/3-(1又4/5+2.65]-1/2最后一个分数是1/3,2.65改为2.63
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(-3/2)-13/4+(-13/3)-8/3=,49.7-[-23又3/4+(18.7-25.25]=,|12.7-(-8.9)|=,4.73-[2又2/3-(1又4/5+2.65]-1/2最后一个分数是1/3,2.65改为2.63
(-3/2)-13/4+(-13/3)-8/3=,49.7-[-23又3/4+(18.7-25.25]=,|12.7-(-8.9)|=,4.73-[2又2/3-(1又4/5+2.65]-1/2
最后一个分数是1/3,2.65改为2.63

(-3/2)-13/4+(-13/3)-8/3=,49.7-[-23又3/4+(18.7-25.25]=,|12.7-(-8.9)|=,4.73-[2又2/3-(1又4/5+2.65]-1/2最后一个分数是1/3,2.65改为2.63
(-3/2)-13/4+(-13/3)-8/3
=-6/4-13/4-13/3)-8/3
=-19/4-21/3
=-11又3/4
49.7-[-23又3/4+(18.7-25.25]
=49.7-[-23-3/4+18.7-25-1/4]
=49.7-[-49+18.7]
=49.7+49-18.7
=31+49
=80
|12.7-(-8.9)|
=|12.7+8.9|
=21.6
4.73-[2又2/3-(1又4/5+2.63)]-1/3
=4.73-[2又2/3-1又4/5-2.63]-1/3
=4.73-2又2/3+1又4/5+2.63-1/3
=4.73+1又4/5+2.63-2又2/3-1/3
=7.36+1.8-3
=6.16