问题 解答题
简便计算
722-301235-190+165986-169-131
167+141+359+33425+438+175463-148
答案

(1)722-301,

=700+22-(300+1),

=700-300+(22-1),

=400+21,

=421;

(2)235-190+165,

=(235+165)-190,

=400-(200-10),

=400-200+10,

=210;

(3)986-169-131,

=986-(169+131),

=986-300,

=686;

(4)167+141+359+33,

=(167+33)+(141+359),

=200+500,

=700;

(5)425+438+175,

=(425+175)+438,

=600+438,

=1038;

(6)463-148,

=440+23-(140+8),

=(440-140)+(23-8),

=300+15,

=315.

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