а) (5/8-2/5)+3/20; б)1/8+(5/9-1/4); в)5/6-(3/10+2/5); г)(3/4+1/8)-5/8.
Муррр
Прошу помогите

а) (5/8 - 2/5) + 3/20 = (25/40 - 16/40) + 6/40 = 9/40 + 6/40 = 15/40 = 3/5.б) 1/8 + (5/9 - 1/4) = 9/72 + (40/72 - 18/72) = 9/72 + 22/72 = 31/72.в) 5/6 - (3/10 + 2/5) = 50/60 - (18/60 + 24/60) = 50/60 - 42/60 = 8/60 = 2/15.г) (3/4 + 1/8) - 5/8 = (6/8 + 1/8) - 5/8 = 7/8 - 5/8 = 2/8 = 1/4.

a)(25/40-16/40)+3/20=9/40+3/20=12/40=0,3б)1/8+(20/36-9/36)=1/8+11/36=9/72+22/72=31/72в)5/6-7/10=25/30-21/30=4/30=2/15г)(6/8+1/8)-5/8=7/8-5/8=1/4.