\( 25-5-3-17+13= \)
\( 12 \)
\( 13 \)
\( 25+6-19+7= \)
\( 19 \)
\( 18 \)
\( 90-2+9-8= \)
89
87
25−5−3−17+13= 25-5-3-17+13= 25−5−3−17+13=
13 13 13
25+6−19+7= 25+6-19+7= 25+6−19+7=
19 19 19
90−2+9−8= 90-2+9-8= 90−2+9−8=