下列能用平方差公式计算的是() A(-x+y)(x-y) B.(x-1)(-1-x) C.(2x+y)(2y-x) D.(x-2)(x+1)2.计算(-5/12)的2005次方×(-2 2/5)的2005次方=() A.-1 B.1 C.0 D.1997 3.已知X的A次方=3,X的B次方=5,则X的3A次方-2B次方
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![下列能用平方差公式计算的是() A(-x+y)(x-y) B.(x-1)(-1-x) C.(2x+y)(2y-x) D.(x-2)(x+1)2.计算(-5/12)的2005次方×(-2 2/5)的2005次方=() A.-1 B.1 C.0 D.1997 3.已知X的A次方=3,X的B次方=5,则X的3A次方-2B次方](/uploads/image/z/3023056-64-6.jpg?t=%E4%B8%8B%E5%88%97%E8%83%BD%E7%94%A8%E5%B9%B3%E6%96%B9%E5%B7%AE%E5%85%AC%E5%BC%8F%E8%AE%A1%E7%AE%97%E7%9A%84%E6%98%AF%EF%BC%88%EF%BC%89+A%EF%BC%88-x%2By%29%28x-y%29+B.%28x-1%29%28-1-x%29+C.%282x%2By%29%282y-x%29+D.%28x-2%29%28x%2B1%292.%E8%AE%A1%E7%AE%97%EF%BC%88-5%2F12%EF%BC%89%E7%9A%842005%E6%AC%A1%E6%96%B9%C3%97%EF%BC%88-2+2%2F5%EF%BC%89%E7%9A%842005%E6%AC%A1%E6%96%B9%3D%EF%BC%88%EF%BC%89+A.-1+B.1+C.0+D.1997+3.%E5%B7%B2%E7%9F%A5X%E7%9A%84A%E6%AC%A1%E6%96%B9%3D3%2CX%E7%9A%84B%E6%AC%A1%E6%96%B9%3D5%2C%E5%88%99X%E7%9A%843A%E6%AC%A1%E6%96%B9-2B%E6%AC%A1%E6%96%B9)
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下列能用平方差公式计算的是() A(-x+y)(x-y) B.(x-1)(-1-x) C.(2x+y)(2y-x) D.(x-2)(x+1)2.计算(-5/12)的2005次方×(-2 2/5)的2005次方=() A.-1 B.1 C.0 D.1997 3.已知X的A次方=3,X的B次方=5,则X的3A次方-2B次方
下列能用平方差公式计算的是() A(-x+y)(x-y) B.(x-1)(-1-x) C.(2x+y)(2y-x) D.(x-2)(x+1)
2.计算(-5/12)的2005次方×(-2 2/5)的2005次方=() A.-1 B.1 C.0 D.1997
3.已知X的A次方=3,X的B次方=5,则X的3A次方-2B次方的值为() A.15 B.9/10 C.3/5 D.27/25
下列能用平方差公式计算的是() A(-x+y)(x-y) B.(x-1)(-1-x) C.(2x+y)(2y-x) D.(x-2)(x+1)2.计算(-5/12)的2005次方×(-2 2/5)的2005次方=() A.-1 B.1 C.0 D.1997 3.已知X的A次方=3,X的B次方=5,则X的3A次方-2B次方
1、B:(x-1)(-1-x)=-(x-1)(1+x)=-(x²-1²)
2、B:(-5/12)^2005×(-2 2/5)^2005=(-5/12 × -12/5)^2005=1^2005=1
3、D:X^(3A-2B)=(X^A)^3 / (X^B)^2=3^3 / 5^2 =27/25