199.4×19.93-199.3×19.

killerep2022-10-04 11:39:540条回答

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199.4*19.93-199.3*19.92的简便计算 小月悠悠1年前4: li0e 共回答了15个问题 | 采纳率80%

199.4×19.93-199.3×19.92
=(199.3+0.1)×19.93-199.3×(19.93-0.01)
=199.3×19.93+19.93×0.1-199.3×19.93+199.3×0.01
=1.993+1.993
=(2-0.007)+(2-0.007)
=4-0.014
=3.986

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