方法一:
7/8-3/10+2/5
=35/40-12/40+16/40
=(35-12+16)/40
=39/40
方法二:
7/8-3/10+2/5
=0.875-0.3+0.4
=0.975
7/8-3/10+2/5脱式计算简便方法?
7/8-3/10+2/5
=35/40 - 12/40 +16/40
=(35+16-12)/40
=(35+4)/40
=39/40
7/8-3/10+2/5
=7/8-3/10+4/10
=7/8+1/10
=35/40+4/40
=39/40
以上就是简便计算过程。
分数计算写在图片上。
7/8—3/10+2/5
=7/8—3/10+4/10
=7/8+(4/10—3/10)
=7/8+1/10
=35/40+4/40
=39/40