How old is Johnson? | 14 years old. |
When is Johnson’s birthday? | (1)_____________. |
What does Johnson like? | (2)_____________. |
What does Eric like? | (3)_____________. |
How much are the sports shoes? | (4)_____________ dollars. |
What does Eric buy for John? | (5)_____________. |
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已知x-y=2,y-z=2,x+z=14,求x2-z2的值.
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