问题 解答题
用递等式计算,能巧算的要巧算.
125×53×801325-1225÷25150+(140×8-252)
178×78-78×78771-169+229-431.
答案

(1)125×53×80,

=125×80×53,

=1000×53,

=53000;

(2)1325-1225÷25,

=1325-49,

=1276;

(3)150+(140×8-252),

=150+(1120-252),

=150+868,

=1018;

(4)178×78-78×78,

=78×(178-78),

=78×100,

=7800;

(5)771-169+229-431,

=(771+229)-(169+431),

=1000-600,

=400.

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