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简便方法计算.98×199

199.7×19.98-199.8×19.96 =199.7×19.98-19.98×199.6 =(199.7-199.6)×19.98 =0.1×19.98 =1.998

您好: 19.98×37-199.8×1.9+1998x0.82 =1998×0.37-1998×0.19+1998+0.82 =1998x(0.37-0.19+0.82) =1998x1 =1998 ~如果你认可我的回答,请及时点击【采纳为满意回答】按钮~ ~手机提问者在客户端右上角评价点【满意】即可。 ~你的采纳是我前进的动...

19.98x37-199.8x1.9+1998x0.82 =19.98x37-19.98x19+19.98x82 =19.98x(37-19+82) =19.98x100 =1998

简便计算 199.9x19.98-199.8X19.97 =199.9x19.98-19.98X199.7 =(199.9-199.7)×19.98 =0.2×19.98 =3.996

1.916+19.97+199.8=2-0.084+20-0.03+200-0.2=2+20+200-(0.084+0.03+0.2) =222-0.314 =221.686

98×199的简便计算 解:采用分配律, 原式=98x(200-1) =98x200-98 =19600-98 =19502

1000×199.9-999×199.8 =(1+999)×199.9-999×199.8 =1×199.9+999×199.9-999×199.8 =199.9+999×(199.9-199.8) =199.9+999×0.1 =199.9+99.9 =299.8

199.8² =(200-0.2)² =40000+0.04-80 =39920.04 如还不明白,请继续追问。 如果你认可我的回答,请及时点击【采纳为满意回答】按钮 手机提问的朋友在客户端右上角评价点【满意】即可。

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