问题
解答题
脱式计算(前3小道进行简便计算):
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答案
(1)456+259+144,
=456+144+259,
=600+259,
=859;
(2)923-458-142,
=923-(458+142),
=923-600,
=323;
(3)635+498,
=635+500-2,
=1135-2,
=1133;
(4)65×106+450,
=6890+450,
=7340;
(5)8000-243×18,
=8000-4374,
=3626;
(6)(45+26)×264,
=71×264,
=18744.