算一算
1+2=
2+1=
1+3=
3+1=
2+2=
2+3=
3+2=
4+1=
5-1=
5-2=
5-3=
5-4=
4-1=
4-2=
4-3=
3-1=
3-2=
1+2=
2+1=
1+3=
3+1=
2+2=
2+3=
3+2=
4+1=
5-1=
5-2=
5-3=
5-4=
4-1=
4-2=
4-3=
3-1=
3-2=
答案:
3,3,4,4,4,5,5,5,4,3,2,1,3,2,1,2,1
在( )里填上合适的数
2+( )=3
2+( )=4
( )+3=4
( )+4=5
( )+3=5
3+( )=4
( )+2=5
( )+1=5
5-( )=4
( )-2=3
5-( )=2
( )-4=1
4-( )=1
3-( )=2
3-( )=1
5-( )=1
2+( )=3
2+( )=4
( )+3=4
( )+4=5
( )+3=5
3+( )=4
( )+2=5
( )+1=5
5-( )=4
( )-2=3
5-( )=2
( )-4=1
4-( )=1
3-( )=2
3-( )=1
5-( )=1
答案:
1,2,1,1,2,1,3,4,1,5,3,5,3,1,2,4
解析:3-2=1,4-2=2,4-3=1,5-4=1,5-3=2,4-3=1,5-2=3,5-1=4,5-4=1,3+2=5,5-2=3,1+4=5,4-1=3,3-2=1,3-1=2,5-1=4
解析:3-2=1,4-2=2,4-3=1,5-4=1,5-3=2,4-3=1,5-2=3,5-1=4,5-4=1,3+2=5,5-2=3,1+4=5,4-1=3,3-2=1,3-1=2,5-1=4
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