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(A)1 4 7 2 5 8 3 6 9 (B)1 2 3 4 5 6 7 8 9 (C)9 6 1 8 5 2 7 4 3 (D)9 8 7 6 5 4 3 2 1
3x-3<(4x+1)-1 3(x-3)<2(4x+1)-1 2(x-3)<3(2x+1)-6 3x-9<4x-4
2x-4-12x+3=9,-10x=9-4+3,故x=0.8 ; 2x-4-12x+3=9,-10x=9+4-3,故x=-1 ; 2x-4-12x-3=9,-10x=9+4+3,故x=-1.6; 2x-2-12x+1=9,-10x=9+2-1,故x=-1 ;
4x+1-10x+1=1 4x+2-10x-1=1 4x+2-10x-1=6 4x+2-10x+1=6
y2-(6x-y+3z)=y2-6x-y+3z 9y2-[x-(5z+4)]=9y2-x+5z+4 x+[-6y+(5z-1)]=x-6y-5z+1 -(7x+y)+(z+4)=-7x-y-z-4
1 4 7 1 2 3 2 5 8 4 5 6 3 6 9 7 8 9 9 6 1 9 8 7 8 5 2 6 5 4 7 4 3 3 2 1
9x3﹣4x2, 9x4+4, 9x3+4x, 9x4﹣4
3x﹣2=3 ﹣x+6=2x 4﹣2(x﹣1)=1 x+1=0
a4b-6a3b+9a2b=a2b(a2-6a+9) x2-x+=(x-)2 x2-2x+4=(x-2)2 4x2-y2=(4x+y)(4x-y)
2x+1-10x-1=1 4x+2-10x-1=6 4x+2-10x+1=1 4x+2-10x+1=6
3x-3< (4x+1)-1 3(x-3)<2(2x+1)-1 2(x-3)<3(2x+1)-6 3x-9<4x-4
(1,] [9,+∞) (1,]∪[9,+∞) [,]∪[9,+∞)
2x+1﹣(10x+1)=1 4x+1﹣10x+1=6 4x+2﹣10x﹣1=6 2(2x+1)﹣(10x+1)=1
1 2 3 4 5 6 7 8 9 9 6 1 8 5 2 7 4 3 1 4 7 2 5 8 3 6 9 9 8 7 6 5 4 3 2 1
x2+3x+2=x(x+3)+2 4x2﹣9=(4x+3)(4x﹣3) x2﹣5x+6=(x﹣2)(x﹣3) a2﹣2a+1=(a+1)2
(x+1)(x+4)=x2+5x+4 (y+4)(y-5)=y2+9y-20 (m+2)(m-3)=m2-m-6 (x-3)(x-6)=x2-9x+18
={x|-6x+8<0}, ={x|2<<8},则A.∪B.= A.{x|2<x<3}B.{x|1<x<3} {x|1<x<4} {x|3<x<4}
4x2﹣5x+2=0 x2﹣6x+9=0 5x2﹣4x﹣1=0 3x2﹣4x+1=0
a4b﹣6a3b+9a2b=a2b(a2﹣6a+9) x2﹣x+=(x﹣)2 x2﹣2x+4=(x﹣2)2 4x2﹣y2=(4x+y)(4x﹣y)