(数学)求a和c列式please?

2015-12-28 12:42 pm

回答 (1)

2015-12-28 3:05 pm
✔ 最佳答案
(a) 20×3−5×3²=15(m)
(b) h=ut−5t²
→ut=h+5t²
→u=h/t+5t
(c) 40/2+5×2=30(m/s)


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