初二数学题,化简求值

2024-12-17 02:00:10
推荐回答(1个)
回答1:

1.4x+2/x²-3=12+2/9-3=83/8
2.2x²-1/x²-2x-1-2/x=(x-1)^2-(1/x+1)^2-(x-1)(x+1)=-2(x-1)-(1/x+1)^2=1-9=-8