问题 解答题

你能用脱式计算吗?

(1)86+44             

=86+4+______,

=______+______,

=______;

(2)137+495              

=137+500-______;

=______-______,

=______.

(3)67+78,

=(60+70)+(______+______);

=130+______,

=______.

答案

(1)86+44,

=86+4+40,

=90+40,

=130;        

(2)137+495,

=137+500-5,

=637-5,

=632;           

(3)67+78,

=(60+70)+(7+8),

=130+15,

=145;

故答案为:(1)40、90、40、130;

         (2)5、637、5、632;

         (3)7、8、15、145.

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