double x[5] =2.0,4.0,6.0,8.0,10.0; int y[5] =0,1,3,5,7,9; char c 1[ ] ='1','2','3','4','5'; char c 2 [C] =,'/x10','/xa','/x8';
double x[5]={2.0,4.0,6.0,8.0,10.0}; int y[5]={0,1,3,5,7,9}; char c1[]={'1','2','3','4','5'}; char c2[]={'/x10','/xa','/x8'};
double x[5]=2.0,4.0,6.0,8.0,10.0; int y[5]=O,1,3,5,7,9; char c1[]='1','2','3','4','5'; char c2[]='/x10','/xa','/x8';
- 0 π
若x,y∈R且x2+y2≠0,则x,y全不为0 若x,y∈R且x2+y2≠0,则x,y不全为0 若x,y∈R且x,y全为0,则x2+y2=0 若x,y∈R且xy≠0,则x2+y2≠0
double x[5]=2.0,4.0,6.0,8.0,10.0; int y[5.3]=0,1,3,5,7,9; charc/[]='1','2','3','4','5'; char c2[]='/x10','/xa','/x8';
x2·x3=x6 (x2)3=x8 x2+x3=x5 x6÷x3=x3
double x[5]={2.0,4.0,6.0,8.0,10.0}; int y[5]={0,1,3,5,7,9}; char c1[]={‘1’,’2’,’3’,’4’,’5’}; char c2[]={‘/x10’,’/xa’,’/x8’};
若
,则X→Y 若X→Y,则XZ→YZ 若X→Y,且
,则X→Z 若X→Y,且Y→Z,则X→Z
2x+8y+z+8=0 2x-8y+z+8=0 2x+8y-z+8=0 2x+8y+z-8=0
double x[5]=2.0, 4.0, 6.0, 8.0, 10.0; int y[5]=0, 1, 3, 5, 7, 9; char c1[]='1', '2', '3', '4', '5'; char c2[]='/x10', '/xa', '/x8';
double x[5]=2.0,4.0,6.0,8.0,10.0; int y[5.3]=0,1,3,5,7,9; char c1[]='1','2','3','4','5'; char c2[]='/x10','/xa','/x8';
double x[5] ={2.0,4.0,6.0,8.0,10.0}; int y[5] ={0,1,3,5,7,9}; char c 1[ ] ={'1','2','3','4','5'}; char c 2 ={,'/x10','/xa','/x8'};