分解因式(x-1)^3+(x-2)^3+(3-2x)^3
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(x-1)^3+(x-2)^3+(3-2x)^3
=[(x-1)+(x-2)][(x-1)^2-(x-1)(x-2)+(x-2)^2]+(3-2x)^3
=(2x-3)(x^2-3x+3)+(3-2x)^3
=(2x-3)(x^2-3x+3)-(2x-3)^3
=(2x-3)[x^2-3x+3-(2x-3)^2]
=(2x-3)(-3x^2+9x-6)
=-3(2x-3)(x^2-3x+1).
=[(x-1)+(x-2)][(x-1)^2-(x-1)(x-2)+(x-2)^2]+(3-2x)^3
=(2x-3)(x^2-3x+3)+(3-2x)^3
=(2x-3)(x^2-3x+3)-(2x-3)^3
=(2x-3)[x^2-3x+3-(2x-3)^2]
=(2x-3)(-3x^2+9x-6)
=-3(2x-3)(x^2-3x+1).
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你好
2(x+3)(x-3)=x^2+(x-2)(x+1)+2x
2(x²-9)=x²+x²-x-2+2x
2x²-18=2x²+x-2
x=-16
5x+6(3x+2)(-2+3x)-54(x-1/3)*(x+1/3)=2
5x+6(3x+2)(3x-2)-54(x²-1/9)=2
5x+6(9x²-4)-54x²+6=2
5x+54x²-24-54x²+6=2
5x=20
x=4
【数学辅导团】为您解答,不理解请追问,理解请及时选为满意回答!(*^__^*)谢谢!
2(x+3)(x-3)=x^2+(x-2)(x+1)+2x
2(x²-9)=x²+x²-x-2+2x
2x²-18=2x²+x-2
x=-16
5x+6(3x+2)(-2+3x)-54(x-1/3)*(x+1/3)=2
5x+6(3x+2)(3x-2)-54(x²-1/9)=2
5x+6(9x²-4)-54x²+6=2
5x+54x²-24-54x²+6=2
5x=20
x=4
【数学辅导团】为您解答,不理解请追问,理解请及时选为满意回答!(*^__^*)谢谢!
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(x-1)^3+(x-2)^3+(3-2x)^3
=[(x-1)+(x-2)][(x-1)^2-(x-1)(x-2)+(x-2)^2]+(3-2x)^3
=(2x-3)(x^2-3x+3)-(2x-3)^3
=(2x-3)[(x^2-3x+3)-(2x-3)^2]
=(2x-3)(-3x^2+9x-6)
=-3(2x-3)(x-1)(x-2)
=[(x-1)+(x-2)][(x-1)^2-(x-1)(x-2)+(x-2)^2]+(3-2x)^3
=(2x-3)(x^2-3x+3)-(2x-3)^3
=(2x-3)[(x^2-3x+3)-(2x-3)^2]
=(2x-3)(-3x^2+9x-6)
=-3(2x-3)(x-1)(x-2)
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