10-10+20-25+55x1
=10-10+20-25+55
=0+20-25+55
=20-25+55
=-5+55
=50
10 - 10 + 20 - 25 + 55 x 1
= 10 - 10 + 20 - 25 + 55
= 0 + 20 - 25 + 55
= 20 - 25 + 55
= - 5 + 55
= 50
10 - 10 + 20 - 25 + 55 × 1
= 0 + 20 - 25 + 55
= 20 - 25 + 55
= ( 20 + 55 ) - 25
= 75 - 25
= 50