要写出过程:(1)(-25)-(-18)-(+5)-(+12)(2)(-3/5)+(4/5)-1/5-3/2+7/4
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要写出过程:(1)(-25)-(-18)-(+5)-(+12)(2)(-3/5)+(4/5)-1/5-3/2+7/4
第二条错了。是(2)-3/5+4/5-1/5-3/2+7/4
第二条错了。是(2)-3/5+4/5-1/5-3/2+7/4
![要写出过程:(1)(-25)-(-18)-(+5)-(+12)(2)(-3/5)+(4/5)-1/5-3/2+7/4](/uploads/image/z/16313973-69-3.jpg?t=%E8%A6%81%E5%86%99%E5%87%BA%E8%BF%87%E7%A8%8B%EF%BC%9A%EF%BC%881%EF%BC%89%EF%BC%88-25%EF%BC%89-%EF%BC%88-18%EF%BC%89-%EF%BC%88%2B5%EF%BC%89-%EF%BC%88%2B12%EF%BC%89%EF%BC%882%EF%BC%89%EF%BC%88-3%2F5%EF%BC%89%2B%EF%BC%884%2F5%EF%BC%89-1%2F5-3%2F2%2B7%2F4)
分析,根据规律,负负得正,负正得负,正负得负
1,
(-25)-(-18)-(+5)-(+12)
=-25+18-5-12
=-7-17
=-24
2,
-3/5+4/5-1/5-3/2+7/4
=1/5-1/5-3/2+7/4
=7/4-3/2
=(7-6)/4
=1/4
1,
(-25)-(-18)-(+5)-(+12)
=-25+18-5-12
=-7-17
=-24
2,
-3/5+4/5-1/5-3/2+7/4
=1/5-1/5-3/2+7/4
=7/4-3/2
=(7-6)/4
=1/4
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