搜狗做题网(7-2x+x^2)-(5+3x-2x^2)=
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(7-2x+x^2)-(5+3x-2x^2)=
-(x^3+2x^2-1)+(x^3-2x^2+x-2)=
(2ax-3by-5)-2(ax-2)+(-2by+1)=
-(x^3+2x^2-1)+(x^3-2x^2+x-2)=
(2ax-3by-5)-2(ax-2)+(-2by+1)=
(7-2x+x^2)-(5+3x-2x^2)
=7-2x+x^2-5-3x+2x^2
=2-5x+3x^2
-(x^3+2x^2-1)+(x^3-2x^2+x-2)
=-x^3-2x^2+1+x^3-2x^2+x-2
=-4x^2+x-1
(2ax-3by-5)-2(ax-2)+(-2by+1)
=2ax-3by-5-2ax+4-2by+1
=-5by
【数学辅导团】为您解答,如果本题有什么不明白可以追问,
=7-2x+x^2-5-3x+2x^2
=2-5x+3x^2
-(x^3+2x^2-1)+(x^3-2x^2+x-2)
=-x^3-2x^2+1+x^3-2x^2+x-2
=-4x^2+x-1
(2ax-3by-5)-2(ax-2)+(-2by+1)
=2ax-3by-5-2ax+4-2by+1
=-5by
【数学辅导团】为您解答,如果本题有什么不明白可以追问,
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
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解方程(x+1/x+2)-(x+2/x+3)=(x+5/x+6)-(x+6/x+7)
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x-1\x-2+x-6\x-7=x-2\x-3+x-5\x-6 分式方程