A.2cm,3cm,4cm,5cm | ||||
B.1.5cm,2.5cm,4.5cm,6.5cm | ||||
C.1cm,
| ||||
D.1.1cm,2.2cm,3.3cm,4.4cm |
2 |
2 |
a+b+c-d |
d |
a+b-c+d |
c |
a-b+c+d |
b |
-a+b+c+d |
a |
(a+b+c)(b+c+d)(a+b+d)(a+c+d) |
abcd |
A.81 | B.3 | C.81或1 | D.3或1 |
x |
y |
2 |
3 |
A.
| B.
| C.
| D.
|
a+b |
b |
A.1.44米 | B.1.52米 | C.1.96米 | D.2.25米 |
x |
6 |
y |
2 |
x+y |
x-y |
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