Question

18.9×178.178＋0.49－17.8×189.189

Answer 1

原式

= 18.9×178.178－17.8×189.189＋0.49

= 18.9×178×1.001-17.8×189×1.001+0.49

= 189×17.8×1.001 -189×17.8×1.001 +0.49

= 0.49

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