OA |
a |
OB |
b |
OA1 |
OA2 |
OA3 |
OAn-1 |
a |
b |
OA1 |
OA |
AA1 |
OA |
1 |
n |
AB |
OA |
1 |
n |
OB |
OA |
a |
1 |
n |
b |
a |
OA2 |
OA |
+AA2 |
OA |
2 |
n |
AB |
OA |
2 |
n |
OB |
OA |
a |
2 |
n |
b |
a |
OAn-1 |
OA |
+AAn-1 |
OA |
n-1 |
n |
AB |
OA |
n-1 |
n |
OB |
OA |
a |
n-1 |
n |
b |
a |
OA1 |
OA2 |
OA3 |
OAn-1 |
a |
1+2+3+…+(n-1) |
n |
b |
a |
a |
n(n-1) |
2n |
b |
a |
n-1 |
2 |
a |
b |
n-1 |
2 |
a |
b |
MA1 |
MA2 |
MA3 |
MA4 |
0 |
A.0 | B.1 | C.2 | D.4 |
PB |
PC |
AB |
MA1 |
MA2 |
MA3 |
MA4 |
MA5 |
0 |
A.0 | B.1 | C.5 | D.10 |
a |
b |
1 |
12 |
a |
b |
a |
b |
A.(5,0) | B.(5,-10) | C.(4,-2) | D.(-4,2) |
AB |
BC |
CD |
A.长方形 | B.梯形 | C.平行四边形 | D.以上都不对 |
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