b2+c2-a2 |
2bc |
a2+b2-c2 |
2ab |
A.0 | B.1 | C.2 | D.-2 |
b2+c2-a2 |
2bc |
a2+b2-c2 |
2ab |
b2-a2+c2 |
2bc |
a2-c2+b2 |
2ab |
(b+a)(b-a)+c2 |
2bc |
(a+c)(a-c)+b2 |
2ab |
c(b-a)+c2 |
2bc |
-b(a+c)+b2 |
2ab |
b-a+c |
2b |
-a-c+b |
2a |
b-(a-c) |
2b |
-a-(c-b) |
2a |
b-(-b) |
2b |
-a-a |
2a |
a+1 |
a-3 |
a-3 |
a+2 |
a2-6a+9 |
a2-4 |
1 |
2 |
n |
m+n |
m |
m-n |
2mn |
m2-n2 |
4 |
a2-2a |
a |
a-2 |
2 |
a |
a-b |
a |
2ab-b2 |
a |
x2-2x+1 |
x2-1 |
2x-2 |
(x+1)2 |
© 2017-2019 超级试练试题库,All Rights Reserved.