(-5)+1/2+7+(-7/3) 4.7+(-3.4)+(-8.3)
2016-09-21
展开全部
(-5)+1/2+7+(-7/3)+4.7+(-3.4)+(-8.3)
=-5+0.5+7-2-1/3+4.7-3.4-8.3
=(-5+7-2+4-3-8)+(0.5+0.7-0.4-0.3)-1/3
=-7+0.5-1/3
=-6.5-1/3
=-6又1/2-1/3
=-6又5/6
=-5+0.5+7-2-1/3+4.7-3.4-8.3
=(-5+7-2+4-3-8)+(0.5+0.7-0.4-0.3)-1/3
=-7+0.5-1/3
=-6.5-1/3
=-6又1/2-1/3
=-6又5/6
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