DG:a=b:(a+b)
DG=
ab |
a+b |
AG=b-
ab |
a+b |
b2 |
a+b |
BM:NF=AB:AN
BM:c=b:(b+c)
BM=
bc |
b+c |
MC=b-
bc |
b+c |
b2 |
b+c |
阴影部分面积
b2 |
a+b |
1 |
2 |
b2 |
a+b |
b2 |
b+c |
1 |
2 |
b2 |
b+c |
1 |
2 |
=
1 |
2 |
ab2 |
a+b |
b3 |
a+b |
b3 |
b+c |
b2c |
b+c |
=
1 |
2 |
=
1 |
2 |
=10
答:阴影部分的面积是10.
ab |
a+b |
ab |
a+b |
b2 |
a+b |
bc |
b+c |
bc |
b+c |
b2 |
b+c |
b2 |
a+b |
1 |
2 |
b2 |
a+b |
b2 |
b+c |
1 |
2 |
b2 |
b+c |
1 |
2 |
1 |
2 |
ab2 |
a+b |
b3 |
a+b |
b3 |
b+c |
b2c |
b+c |
1 |
2 |
1 |
2 |