27x57 - (2x5)7, 315x75x1010 - [3x7x(2x3)2]5, 55 - 58÷53, 1÷106 - (102÷104)3, 1 - (9955)0, 510 - (55÷53)5, 25 - 27÷22, 34÷218 - (29÷32)-2, 1÷553 - 553÷556, 311 - 399÷388,

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