两条直线相交,如果所成的四个角中有一个角是钝角,那么另外三个角中只能有一个角是钝角. .
( )+356=912 128-( )=11
( )+125=352 408-( )=205
( )+351=652 125-( )=22
( )+325=561 641-( )=365 ( )-158=369 356+( )=515
( )+148=742 512-( )=259 ( )-201=125 456+( )=545