作业帮(1)(2x²-7x+5)+(3x-1)-(x²-1) (2)x-3(1-2x+x²)+3
来源：学生作业帮 编辑：作业帮 分类：数学作业 时间：2024/05/12 16:17:45
(1)(2x²-7x+5)+(3x-1)-(x²-1) (2)x-3(1-2x+x²)+3(-2+3x-x²) (3)3a+二分之一(a-6b)-三
(4)5a+(-2a)+｛a+1+(2a+a)+[a+1-(a+3)]｝
(4)5a+(-2a)+｛a+1+(2a+a)+[a+1-(a+3)]｝
(1)(2x²-7x+5)+(3x-1)-(x²-1)
=2x^2-7x+5+3x-1-x^2+1
=x^2-4x+5
(2)x-3(1-2x+x^2)+3(-2+3x-x^2)
=x-3+6x-3x^2-6+9x-3x^2
=-6x^2+16x-9
(3)3a+1/2(a-6b)-3
=3a+1/2a-3b-3
=7/2a-3b-3
(4)5a+(-2a)+｛a+1+(2a+a)+[a+1-(a+3)]｝
=3a+(4a+1+a+1-a-3)
=3a+4a-1
=7a-1
=2x^2-7x+5+3x-1-x^2+1
=x^2-4x+5
(2)x-3(1-2x+x^2)+3(-2+3x-x^2)
=x-3+6x-3x^2-6+9x-3x^2
=-6x^2+16x-9
(3)3a+1/2(a-6b)-3
=3a+1/2a-3b-3
=7/2a-3b-3
(4)5a+(-2a)+｛a+1+(2a+a)+[a+1-(a+3)]｝
=3a+(4a+1+a+1-a-3)
=3a+4a-1
=7a-1
|X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10|
(x+1-1/1-x)÷(x-x²/x-1) (x-4/x-x-6+ x+2/x-3)÷x+1/x-3
x(x²-1)+2x²（x+1)-3x（2x-5)计算
(（x²-5x+6)/(12-7x+x²))²÷((x²+3x+2)/(x
x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
6x+(2x²-3x)-(x²-1)
（2x²-2x+3)(-x³+x-1)
x²+3x+9/(x²-27)+6x/(9x-x²)-(x-1)/(6+2x)
(x+1)/(x²+3x+2)+(x²-2x)/(x²-4)
x-1)(X-2)(x-3)...(x-50)+x(x-2)(X-3)...(X-50)+...+x(x-1)(x-2)
①2(x+3)(x-3)=x²+(x-1)(x+1)+2x