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The fifth grade mathematics synchronous answer
I 1。 (1) 800 (2) 502. (1) 3 (2) 8: 30-9: 00 and 10: 00- 10: 30.

3. Omit 4. (1) 3 (2)130 (3) (50+150+250)/3 =150 (km/h)

(4)50-0=50 (km/h) 150-50= 100 (km/h) 250- 150= 100 (km/h)

A: .........................................

Second, omitted.

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