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3x-2x=-1+5 -3x-2x=5-1 3x-2x=-1-5 -3x-2x=-1-5
if(c< x=1; else if(b< x=2; else x=3; if(a<3) x=3; else if(a<2) x=2; else x=1; if(a<3) x=3; if (a<2) x=2; if (a<1) x=1; if (a< x=b; if (b< x=c; if (c< x=a;
int x[][3]={{0},{1},{1,2,3}}; int x[4][3]={{1,2,3},{1,2,3},{1,2,3},{1,2,3}}; int x[4][]={{1,2,3},{1,2,3},{1,2,3},{1,2,3}}; int x[][3]={1,2,3,4};
={x|﹣1<x<2},集合 ={x|1<x<3},则A.∪B=( ) A.{x|﹣1<x<3}B.{x|﹣1<x<1} {x|1<x<2} {x|2<x<3}
int X[][3]=0,1,1,2,3; int X[4][3]=[1,2,3,1,2,3,1,2,31,2,3 int X[4][]=1,2,3,1,2,3,1,2,3,1,2,3; int X[][3]=1,2,3,4;
int x[4][]=1,2,3,1,2,3,1,2,3,1,2,3; int x[4][3]=1,2,3,1,2,3,1,2,3,1,2,3; int x[][3]=0,1,1,2,3; int x[][3]=1,2,3,4;
3(x-1)-2(2+3x)=1 3(x-1)+2(2x+3)=1 3(x-1)+2(2+3x)=6 3(x-1)-2(2x+3)=6
由3x-2=2x-1,得3x+2x=1+2 由x-1=2x+2,得x-2x=2-1 由2x-1=3x-2,得2x-3x=1-2 由2x+1=3-x,得2x+x=3+1
{x|-3<x≤-2或1≤x<2} {x|-3<x≤-2或1≤x} {x|-3≤x<-2或1<x≤2} {x|x<-3或1<x≤2}
int x[ ][3]={{0},{1},{1,2,3}}; int x[4][3]={{1,2,3},{1,2,3},{1,2,3},{1,2,3}}; int x[4][ ]={{1,2,3},{1,2,3},{1,2,3},{1,2,3}}; int x[ ][3]={1,2,3,4};
3(x﹣1)﹣2(2x+3)=6 3(x﹣1)﹣2(2x+3)=1 2(x﹣1)﹣2(2x+3)=6 3(x﹣1)﹣2(2x+3)=3
3(x-1)-2(2+3x)=1 3(x-1)+2(2x+3)=1 3(x-1)+2(2+3x)=6 3(x-1)-2(2x+3)=6
int x[][3]=0,1,1,2,3; int x[4][3]=1,2,3,1,2,3,1,2,3,1,2,3; int x[4][]=1,2,3,1,2,3,1,2,3,1,2,3; int x[][3]=1,2,3,4;
18x+2(2x﹣1)=18﹣3(x+1) 3x+(2x﹣1)=3﹣(x+1) 18x+(2x﹣1)=18﹣(x+1) 3x+2(2x﹣1)=3﹣3(x+1)
int x[][3]=0, 1, 1, 2, 3; int x[4][3]=1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3; intx[4][]=1, 2, 3), 1, 2, 3, 1, 2, 3), 1, 2, 3; int x[][3]=1, 2, 3, 4;
x1=1,x2=3 x1=1,x2=﹣3 x1=﹣1,x2=3 x1=﹣1,x2=﹣3
int x[][3]=(0,1,1,2,3); int x[4][3]=1,2,3,1,2,3,1,2,3,1,2,3); int x[4][]=1,2,3,1,2,3,1.2,3,1,2,3); int x[][3]=1,2,3,4;
(3x+1)(3x-1)=9x2-1 x2-2x+4=(x-2)2 a4-1=(a2+1)(a+1)(a-1) 9x2-1+3x=(3x+1)(3x-1)+3x
1﹣2x=3 x﹣1﹣2x=3 1+2x=3 x﹣1+2x=3