分解因式 2m的平方n-3mn的平方=mn(2m-3n)判断是否正确.错误请改正.1:2m²n-3mn²=mn(2m-3n)2:-2a²-4a=-2(a+2)3:16x²-25=(4x+5)(-4x+5)4:3x³+2x²+x=x(3x²+2x)5:10x³-5x²+20x=5x
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![分解因式 2m的平方n-3mn的平方=mn(2m-3n)判断是否正确.错误请改正.1:2m²n-3mn²=mn(2m-3n)2:-2a²-4a=-2(a+2)3:16x²-25=(4x+5)(-4x+5)4:3x³+2x²+x=x(3x²+2x)5:10x³-5x²+20x=5x](/uploads/image/z/594279-63-9.jpg?t=%E5%88%86%E8%A7%A3%E5%9B%A0%E5%BC%8F+2m%E7%9A%84%E5%B9%B3%E6%96%B9n-3mn%E7%9A%84%E5%B9%B3%E6%96%B9%3Dmn%282m-3n%29%E5%88%A4%E6%96%AD%E6%98%AF%E5%90%A6%E6%AD%A3%E7%A1%AE.%E9%94%99%E8%AF%AF%E8%AF%B7%E6%94%B9%E6%AD%A3.1%EF%BC%9A2m%26%23178%3Bn-3mn%26%23178%3B%3Dmn%282m-3n%292%EF%BC%9A-2a%26%23178%3B-4a%3D-2%EF%BC%88a%2B2%EF%BC%893%EF%BC%9A16x%26%23178%3B-25%3D%EF%BC%884x%2B5%EF%BC%89%EF%BC%88-4x%2B5%EF%BC%894%3A3x%26%23179%3B%2B2x%26%23178%3B%2Bx%3Dx%EF%BC%883x%26%23178%3B%2B2x%EF%BC%895%3A10x%26%23179%3B-5x%26%23178%3B%2B20x%3D5x)
分解因式 2m的平方n-3mn的平方=mn(2m-3n)判断是否正确.错误请改正.1:2m²n-3mn²=mn(2m-3n)2:-2a²-4a=-2(a+2)3:16x²-25=(4x+5)(-4x+5)4:3x³+2x²+x=x(3x²+2x)5:10x³-5x²+20x=5x
分解因式 2m的平方n-3mn的平方=mn(2m-3n)
判断是否正确.错误请改正.
1:2m²n-3mn²=mn(2m-3n)
2:-2a²-4a=-2(a+2)
3:16x²-25=(4x+5)(-4x+5)
4:3x³+2x²+x=x(3x²+2x)
5:10x³-5x²+20x=5x(2x²-x+4)
6:x²-3x+2=(x-1)(x-2)
分解因式 2m的平方n-3mn的平方=mn(2m-3n)判断是否正确.错误请改正.1:2m²n-3mn²=mn(2m-3n)2:-2a²-4a=-2(a+2)3:16x²-25=(4x+5)(-4x+5)4:3x³+2x²+x=x(3x²+2x)5:10x³-5x²+20x=5x
1:2m²n-3mn²=mn(2m-3n)……………………(√)
2:-2a²-4a=-2(a+2)…………………………(×)
-2a²-4a= -2a(a+2)
3:16x²-25=(4x+5)(-4x+5)………………(×)
16x²-25=(4x+5)(4x-5)
4:3x³+2x²+x=x(3x²+2x)………………………(×)
3x³+2x²+x=x(3x²+2x+1)
5:10x³-5x²+20x=5x(2x²-x+4)…………………(√)
6:x²-3x+2=(x-1)(x-2)………………………(√)
1对
2错,-2a²-4a=-2a(a+2)
3错,16x²-25=(4x+5)(4x-5)
4错,3x³+2x²+x=x(3x²+2x+1)
5对
6对
1,对
2,对
3,错,差负号
4,错,x(3x²+2x+1)
5,对
6,对
-2a²-4a=-2a(a+2)
16x²-25=(4x+5)(4x-5)
3x³+2x²+x=x(3x^2+2x+1)
其余的都正确