Question

43°45′+47°40′37〃= 43°13′28〃除以2-10°5′18〃

Answer 1

43°45′+47°40′37"

=(43°+45′)+(47°+40′+37")

=90°+85′+37"

=90°+60'+25′+37"

=91°+25′+37"

=91°25′37"

43°13′28"除以2-10°5′18"

=(43°+13′+28")/2-10°5′18"

=(42°+1°+12′+1'+28")/2-10°5′18"

=(42°+60'+12′+60"+28")/2-10°5′18"

=(42°+72'+88")/2-(10°+5′+18")

=42°/2+72'/2+88"/2-10°-5′-18"

=21°+36′+44"-10°-5′-18"

=11°+31′+26"

=11°31′26"