想一想,算一算,你发现了什么?
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(1)9 ×9-9= |
9 ×7+9= |
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(2)9 ×8-9= |
9 ×6+9= |
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(3)9 ×7-9= |
9 ×4+9= |
我来填.
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(1)9 ×4+9=□ |
(2)6 ×9+□=63 |
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(3)2 ×9-9=□ |
(4)7 ×9-□=54 |
算一算,想一想.
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(1)5×7 +7= |
(2)7 ×3+7= |
(3)6 ×7-7= |
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6 ×7= |
4 ×7= |
5 ×7= |
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7 ×6= |
7 ×4= |
7 ×5= |
这样的算式我也会写!
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算一算.
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(1)3 +6+70= |
(2)55 -30-7= |