原式=(13*4+25)/100-9/14=77/100-9/14=(77*14-900)/1400=178/1400=89/700
13/25+(1/4-9/14)
=13/25+(7/28-18/28)
=13/25-11/28
=364/700-275/700
=89/700
13/25+(1/4-9/14)
=13/25+1/4-9/14
=364/700+175/700-450/700
=(364+175-450)/700
=89/700
=13/25+(7/28-18/28)
=13/25-11/28
=364/700-275/700
=89/700