你能用脱式计算吗?
(1)86+44
=86+4+ ,
= + ,
= ;
(2)137+495
=137+500﹣ ;
= ﹣ ,
= .
(3)67+78,
=(60+70)+( + );
=130+ ,
= .
你能用脱式计算吗?
(1)86+44
=86+4+ ,
= + ,
= ;
(2)137+495
=137+500﹣ ;
= ﹣ ,
= .
(3)67+78,
=(60+70)+( + );
=130+ ,
= .
试题篮
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