x-y=1
(x-y)²=1
x²-2xy+y²=1
∵x²+y²=25
∴2xy=24
xy=12
猜你喜欢
- 1形容书多的成语
- 21 2 3 4 5 6 7 8 9 =100 用两个加号两个减号填入1——9的空格中,使等式成立
- 3已知集合A=｛x ｜x^2-4mx+2m+6=0｝,B=｛x｜x＜0｝若A∩B≠空集,求实数m的取值范围
- 4I go to school by bike every day.Today I went to school by bike,too.同义句Today I went
- 5500字美文摘抄和赏析
- 6物体做匀变速运动,依次经过ABC三点,vAB=3m/s,vBC=6m/s,AB=BC,求vA,vB,vC.
- 7函数Y=LOG1/2（X平方-6X+17）的值域?
- 8两列火车同时从甲、乙两地相对开出．快车行完全程需要20小时，慢车行完全程需要30小时．开出后15小时两车相遇．已知快车中途停留4小时，慢车停了几小时？
- 9一根绳子截取四分之一,加上十二米.结果比原来的长三分之一,求原来绳子有多长?
- 10tom failed the exam again,___his parents would