1.化简:x²-4y²/x²+y²+2xy÷2y+x/x²+xy.2.化简a^4-a²b²/(a-b)²÷a(a+b)/b²,b²/a的结果是__________.3.已知x+1/x=3,则x²+1/x²=__________.4.汽车从甲地开往乙地,每小时行驶V
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1.化简:x²-4y²/x²+y²+2xy÷2y+x/x²+xy.2.化简a^4-a²b²/(a-b)²÷a(a+b)/b²,b²/a的结果是__________.3.已知x+1/x=3,则x²+1/x²=__________.4.汽车从甲地开往乙地,每小时行驶V
1.化简:x²-4y²/x²+y²+2xy÷2y+x/x²+xy.
2.化简a^4-a²b²/(a-b)²÷a(a+b)/b²,b²/a的结果是__________.
3.已知x+1/x=3,则x²+1/x²=__________.
4.汽车从甲地开往乙地,每小时行驶V1千米,t小时到达.如果每小时多行驶V2千米,那么可提前_________小时到达.
5.一组学生春游,预计共需要车费120元,后来人数增加了1/4,但车费仍不变.如果这组学生原有x人,那么增加人数后每人少付车费_________元.
6.a、b为实数,且ab=1.设P=a/a+1+b/b+1,Q=1/a+1+1/b+1,则P__________Q(填“>”、“<”或“=”).
1.化简:x²-4y²/x²+y²+2xy÷2y+x/x²+xy.2.化简a^4-a²b²/(a-b)²÷a(a+b)/b²,b²/a的结果是__________.3.已知x+1/x=3,则x²+1/x²=__________.4.汽车从甲地开往乙地,每小时行驶V
2.题b的4次方/(a-b)
3题x²+1/x²=(x+1/x)²-2=3²-2=7
4题t-v1t/(v1+v2)=v2t/(v1+v2)
5题120/x-120/(x+1/4x)=24/x
6题P=Q通分即可