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.