. .
. v .
+=
+=
-=
+=
+=
-=
+=
-=
+=
-=
-=
-=
-=
+=
+=
-=
+=
+=
-=
-=
-=
+=
+=
-=
. .
. v .
+=
-=
+=
+=
-=
-=
+=
-=
-=
+=
-=
+=
-=
-=
+=
-=
-=
+=
+=
+=
-=
+=
+=
-=
. .
. v .
-=
+=
-=
-=
+=
-=
+=
-=
+=
-=
+=
-=
-=
+=
-=
+=
+=
-=
+=
-=
-=
+=
-=
-=
.
带两位小数的加减法计算 来自淘豆网m.daumloan.com转载请标明出处.