Đáp án:
`2C_2H_6+7O_2` `->` `6H_2O+4CO_2`
Tỉ lệ: `2 : 7 : 6 : 4`
2C2H6+7O2->6H2O+4CO2.
Giải thích các bước giải:
1-x^2/x+1+x^3/x-1+2x^2+x/x
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