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to leave for been away 肯定正确...
I have a good friend whoes English name is lisa.She is twelve years old and she is a very pretty girl.Everyone in our class including teachers like her,but I am her only best friend.We share everythi....
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陶醉:因感触到某美好的事物后产生出感官或心理上的享受,并由此达到舒畅甚至忘我的感觉. 忧心忡忡:因某不好的事物而时刻充满忧虑. 书香门第:门第指较大户的...
√(b^2-4ac)/(a的绝对值)=√91/6 (b^2-4ac)/a^2=91/36 36(b^2-4ac)=91a^2 2a 3b=-4c 36[b^2 a(2a 3b)]=91a^2 36b^2 72a^2 108ab=91a^2 19a^2-108ab-36b^2=0 a=(108b 120b)/38=228b/38=6b x=-b/2a=-1/12 或a=(108b-120b)/...