这个算式怎么写?(要写出过程)-4.2+5.7-8.4+10 12-(-18)+(-7)-15
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这个算式怎么写?(要写出过程)-4.2+5.7-8.4+10 12-(-18)+(-7)-15
这个算式怎么写?(要写出过程)
-4.2+5.7-8.4+10 12-(-18)+(-7)-15
这个算式怎么写?(要写出过程)-4.2+5.7-8.4+10 12-(-18)+(-7)-15
你这是2个题吗?要是是的话
-4.2+5.7-8.4+10
=5.7+10-4.2-8.4
=15.7-(4.2+8.4)
=15.7-12.6
=3.1
12-(-18)+(-7)-15
=12+18-7-15
=30-(7+15)
=30-22
=8
ggjytguihjbhjvh
原式=-4.2+5.7-8.4+10
=(-4.2)+5.7+(-8.4)+10
=[(-4.2)+(-8.4)]+(5.7+10)
=(-12.6)+15.7
=3.1