255/8-53/4-4.25

更新时间2018-06-18 15:34:50

原式=

255/8-(53/4+4.25)

=255/8-10

=155/8

你把后面的加个括号就行，加起来等于10

255/8-53/4-4.25

=31.875-(13.25+4.25)

=31.875-17.5

=14.375

.

(25+5/8)-(5+3/4)-4.25

=(25+5/8)-[(5+3/4)+(4+1/4)]

=(25+5/8)-10

=(15+5/8)