问题 解答题
用简便方法计算.
144+99

735-498

199+296

526-298.
答案

(1)144+99,

=144+100-1,

=243;

(2)735-498,

=735-500+2,

=237;

(3)199+296,

=200+300-1-4,

=495;

(4)526-298,

=526-300+2,

=228.

解答题
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