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Вопрос по математике:
Решите примеры удобным способом:
123+23+444+77=
111+(726+209)=
111+65+135+589=
2347-(137+862)=-
Автор:
adele
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1)23+77=100. 2)111+209=320 100+123=223. 320+726=1046 223+444=667. 3)65+135=200. 4)2347-137=2210 589+111=700. 2210-862=1348 700+200=900
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