(1)9992+999
=999×(999+1)
=999×1000
=999000;
(2)112+13×66+392
=112+2×11×39+392
=(11+39)2
=502
=2500.
用简便方法计算: (1)9992+999; (2)112+13×66+392.
用简便方法计算:
(1)9992+999;
(2)112+13×66+392.
(1)9992+999;
(2)112+13×66+392.
数学人气:147 ℃时间:2019-12-18 19:02:49
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