化简:(x+y)(x-y)-2(4-y^2+1/2x^2) 赶紧回答吧,(x+y)(x-y)-2[4-y^2+(1/2)x^2] 是化简,不是计算!
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![化简:(x+y)(x-y)-2(4-y^2+1/2x^2) 赶紧回答吧,(x+y)(x-y)-2[4-y^2+(1/2)x^2] 是化简,不是计算!](/uploads/image/z/1116581-5-1.jpg?t=%E5%8C%96%E7%AE%80%EF%BC%9A%28x%2By%29%28x-y%29-2%284-y%5E2%2B1%2F2x%5E2%29+%E8%B5%B6%E7%B4%A7%E5%9B%9E%E7%AD%94%E5%90%A7%2C%EF%BC%88x%2By%29%28x-y%29-2%5B4-y%5E2%2B%281%2F2%29x%5E2%5D+%E6%98%AF%E5%8C%96%E7%AE%80%EF%BC%8C%E4%B8%8D%E6%98%AF%E8%AE%A1%E7%AE%97%EF%BC%81)
化简:(x+y)(x-y)-2(4-y^2+1/2x^2) 赶紧回答吧,(x+y)(x-y)-2[4-y^2+(1/2)x^2] 是化简,不是计算!
化简:(x+y)(x-y)-2(4-y^2+1/2x^2) 赶紧回答吧,
(x+y)(x-y)-2[4-y^2+(1/2)x^2] 是化简,不是计算!
化简:(x+y)(x-y)-2(4-y^2+1/2x^2) 赶紧回答吧,(x+y)(x-y)-2[4-y^2+(1/2)x^2] 是化简,不是计算!
x+y)(x-y)-2(4-y^2+1/2x^2) =x^2-y^2-8+2y^2-x^2=y^2-8