Вычислите, используя свойства сложения:
1) (-5+19)+(-19)=
2) (-16+(-17))+17=
3) -0,4+0,8+0,4=
4) (-2/7+1)+(-5/7)=
5) 4/15+(-8/25)+(-4/15)=
6) 9+(-12)+(-9)+20=
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