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怎么写啊!
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(1)4.7-3.4+(-8.3)
=1.3-8.3
=-7
(2)(-2.5)-1/2+(-1/5)
=-3-1/5
=-3又1/5
(3)1/2-(-0.25)-1/6
=3/4-1/6
=7/12
(4)1/3+(-5/6)-(-1/2)-2/3
=-1/2+1/2-2/3
=0-2/3
=-2/3
=1.3-8.3
=-7
(2)(-2.5)-1/2+(-1/5)
=-3-1/5
=-3又1/5
(3)1/2-(-0.25)-1/6
=3/4-1/6
=7/12
(4)1/3+(-5/6)-(-1/2)-2/3
=-1/2+1/2-2/3
=0-2/3
=-2/3
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