Используя свойства сложения и вычитания вычислить: 229+177+(-229)=... б)637+129+663=.............. 578+(-123)+122=....... 978+127+222=.................. 557+127+222=.................... 557+(-366)+143=.................... 927+(-227)+125=................. 775+121+525=.................... 377+469+(-346)=.............. 228+791+(-571)=............. 723+566+(-523) + действия
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