Пошаговое объяснение:
7/x -1/(5x)=(35-1)/(5x)=34/(5x)=34/(5·(-0,8))=34/(-4)=-17/2=-8,5
8/x -4/(5x)=(40-4)/(5x)=36/(5x)=36/(5·1,6)=36/8=9/2=4,5
36/(4a-a²) -9/a=36/(a(4-a)) -9(4-a)/(a(4-a))=(36-36+9a)/(a(4-a))=9/(4-a)=9/(4-14)=-9/10=-0,9
42/(7a-a²) -6/a=42/(a(7-a)) -6(7-a)/(a(7-a))=(42-42+6a)/(a(7-a))=6/(7-a)=6/(7-2)=6/5=1,2
1/x -(x+y)/(xy)=(y-x-y)/(xy)=-1/y=-1/(1/5)=-5
(a²-4)/(2a²+4a)=(a-2)(a+2)/(2a(a+2))=(a-2)/(2a)=(0,5-2)/(2·0,5)=-1,5/1=-1,5
(a²-9)/(6a²-18a)=(a-3)(a+3)/(6a(a-3))=(a+3)/(6a)=(-0,3+3)/(6·(-0,3))=2,7/(-1,8)=-27/18=-3/2=-1,5
(a²+4a)/(a²+8a+16)=a(a+4)/(a+4)²=a/(a+4)=-2/(-2+4)=-2/2=-1
Пошаговое объяснение:
7/x -1/(5x)=(35-1)/(5x)=34/(5x)=34/(5·(-0,8))=34/(-4)=-17/2=-8,5
8/x -4/(5x)=(40-4)/(5x)=36/(5x)=36/(5·1,6)=36/8=9/2=4,5
36/(4a-a²) -9/a=36/(a(4-a)) -9(4-a)/(a(4-a))=(36-36+9a)/(a(4-a))=9/(4-a)=9/(4-14)=-9/10=-0,9
42/(7a-a²) -6/a=42/(a(7-a)) -6(7-a)/(a(7-a))=(42-42+6a)/(a(7-a))=6/(7-a)=6/(7-2)=6/5=1,2
1/x -(x+y)/(xy)=(y-x-y)/(xy)=-1/y=-1/(1/5)=-5
(a²-4)/(2a²+4a)=(a-2)(a+2)/(2a(a+2))=(a-2)/(2a)=(0,5-2)/(2·0,5)=-1,5/1=-1,5
(a²-9)/(6a²-18a)=(a-3)(a+3)/(6a(a-3))=(a+3)/(6a)=(-0,3+3)/(6·(-0,3))=2,7/(-1,8)=-27/18=-3/2=-1,5
(a²+4a)/(a²+8a+16)=a(a+4)/(a+4)²=a/(a+4)=-2/(-2+4)=-2/2=-1