1133°. Используя переместительный и сочетательный законы,
выполните сложение удобным способом:
1) -2 + (-3) + (-8) + (-7); 3) -119 + 19,7 + (-91);
2) 13 + 26 + (-3) + (-16): 4) 78,2+(-105) + 11,8.​
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