|
|
∴x:z=(-6y):(-9y)=2:3.
(2)由(1)中x=-6y,z=-9y,
∴x:y:z=(-6y):y:(-9y)=(-6):1:(-9).
(3)同樣由(1)中x=-6y,z=-9y,
∴
xy+2yz |
x2+y2?z2 |
(?6y)?y+2y?(?9y) |
(?6y)2+y2?(?9y)2 |
?24y2 |
?44y2 |
6 |
11 |
|
xy+2yz |
x2+y2?z2 |
|
|
xy+2yz |
x2+y2?z2 |
(?6y)?y+2y?(?9y) |
(?6y)2+y2?(?9y)2 |
?24y2 |
?44y2 |
6 |
11 |