计算.
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(1)3 +2= |
(2)4 +1= |
(3)2 +2= |
(4)2 +1= |
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(5)5 -2= |
(6)5 -4= |
(7)4 -2= |
(8)3 -2= |
先用圆片摆一摆,再计算.
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(1)5 -2=□ |
(2)4 -1=□ |
(3)3 -2=□ |
(4)4 -3=□ |
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(5)3 -1=□ |
(6)5 -3=□ |
(7)4 -2=□ |
(8)5 -4=□ |
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(1)0 -0=□ |
1 -0=□ |
1 -1=□ |
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(2)2 -0=□ |
2 -1=□ |
2 -2=□ |
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(3)3 -0=□ |
3 -1=□ |
3 -2=□ |
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3-3=□ |
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(4)4 -0=□ |
4 -1=□ |
4 -2=□ |
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4-3=□ |
4 -4=□ |
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