已知A=4x²-1/3x+1,B=3x²+2/3x-4,求5A-3B-[5A-(A+2B)]
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![已知A=4x²-1/3x+1,B=3x²+2/3x-4,求5A-3B-[5A-(A+2B)]](/uploads/image/z/1261053-45-3.jpg?t=%E5%B7%B2%E7%9F%A5A%3D4x%26%23178%3B-1%2F3x%2B1%2CB%3D3x%26%23178%3B%2B2%2F3x-4%2C%E6%B1%825A-3B-%5B5A-%28A%2B2B%29%5D)
已知A=4x²-1/3x+1,B=3x²+2/3x-4,求5A-3B-[5A-(A+2B)]
已知A=4x²-1/3x+1,B=3x²+2/3x-4,求5A-3B-[5A-(A+2B)]
已知A=4x²-1/3x+1,B=3x²+2/3x-4,求5A-3B-[5A-(A+2B)]
5A-3B-[5A-(A+2B)]
=5A-3B-5A+A+2B
=A-B
=(4x²-1/3x+1)-(3x²+2/3x-4)
=4x²-1/3x+1-3x²-2/3x+4
=x²-x+5.