问题 解答题

口算:

996-283-117=

436+685-336=

99999+9999+999+99+9=

25×11×125×32=

答案

(1)996-283-117,

=996-(283+117),

=996-400,

=596;

(2)436+685-336,

=436-336+685,

=100+685,

=785;

(3)99999+9999+999+99+9,

=(100000-1)+(10000-1)+(1000-1)+(100-1)+(10-1),

=111110-5,

=111105;

(4)25×11×125×32,

=(25×4)×(125×8)×11,

=100×1000×11,

=1100000.

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