38-15拆数法怎么做
38-15拆数法计算过程方法如下
解:38-15
=(30+8)-(15+5)
=30+8-10-5
=(30-10)+(8-5)
=20+3
=23
解:38-15
=(30+8)-(15+5)
=30+8-10-5
=(30-10)+(8-5)
=20+3
=23
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第1个回答 2020-04-02
解:38-15等于( 23 )
∵已知需求出38-15等于多少
X - Y = Z
∴38 - 15
= (40 - 2)- (20 - 5)
= 40 - 2 - 20 + 5
= (40 - 20) + (-2 + 5)
= 20 + 3
= 23
答:38-15等于23
∵已知需求出38-15等于多少
X - Y = Z
∴38 - 15
= (40 - 2)- (20 - 5)
= 40 - 2 - 20 + 5
= (40 - 20) + (-2 + 5)
= 20 + 3
= 23
答:38-15等于23
第2个回答 2020-04-02
拆数法
38-15
=38-(10+5)
=38-10-5
=28-5
=23
38-15
=38-(10+5)
=38-10-5
=28-5
=23
第3个回答 2020-04-02
38一15
=(3O一10)十(8一5)
=20十3
=23
=(3O一10)十(8一5)
=20十3
=23
第4个回答 2020-04-02
23......