設(shè)螃蟹X只,蜻蜓Y只.蟑螂Z只.
X+Y+Z=18
10X+6Y+6Z=120
2Y+Z=19
解得：X=3
Y=4
Z=11
答：螃蟹3只.蜻蜓4只.蟑螂11只
一只螃蟹10只腳,一只蜻蜓6只腳兩對(duì)翅膀,蟑螂6只腳一對(duì)翅膀螃蟹蜻蜓蟑螂共18只共腳120只翅膀19對(duì)個(gè)多少只
一只螃蟹10只腳,一只蜻蜓6只腳兩對(duì)翅膀,蟑螂6只腳一對(duì)翅膀螃蟹蜻蜓蟑螂共18只共腳120只翅膀19對(duì)個(gè)多少只
數(shù)學(xué)人氣：610 ℃時(shí)間：2020-04-14 05:19:41
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