а)3/7y+2/3y+y-2/3y=3/7*7/10+2/3*7/10+7/10-2/3*7/10=3/7*7/10+7/10=21/70+7/10=70/70=1
b)3/7*14+2/3*14+14-2/3*14=3/7*14+14=3/7+10 3/7
а)3/7y+2/3y+y-2/3y=3/7*7/10+2/3*7/10+7/10-2/3*7/10=3/7*7/10+7/10=21/70+7/10=70/70=1
b)3/7*14+2/3*14+14-2/3*14=3/7*14+14=3/7+10 3/7