问题 解答题
用简便方法计算.
427-156-441230-299137+149+163.
答案

(1)427-156-44,

=427-(156+44),

=427-200,

=227;

(2)1230-299,

=1230-300+1,

=931;

(3)137+149+163,

=137+163+149,

=(137+163)+149,

=300+149,

=449.

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