4.25×166-42又1/2×14.2+24×5.75？
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4.25×166-42又1/2×14.2+24×5.75
=4.25×166-42.5×14.2+24×(1-4.25)
=4.25×166-4.25×142-24×4.25+24
=4.25×(166-142-24)+24
=4.25×0+24
=24
=4.25×166-42.5×14.2+24×(1-4.25)
=4.25×166-4.25×142-24×4.25+24
=4.25×(166-142-24)+24
=4.25×0+24
=24
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