28/103
7x=2y,原式=(7x*x-3xy+2y*y)/(2x*x-3xy+7y*y)
=(2xy-3xy+7xy)/(4/7*xy-3xy+49/2*xy)
=28/103
若x/y=2/7则7x²-3xy+2y²/2x²-3xy+7y²=
若x/y=2/7则7x²-3xy+2y²/2x²-3xy+7y²=
x 2 7x²-3xy+2y²
__= __ _____________ =
y 7 2x²-3xy+7y²
x 2 7x²-3xy+2y²
__= __ _____________ =
y 7 2x²-3xy+7y²
数学人气:563 ℃时间:2019-11-17 09:26:57
优质解答
我来回答
类似推荐
猜你喜欢
- 1分数中一定大于1的数是()A真分数B假分数C带分数
- 22013襄阳 小芳家电能表铭牌上标有220v 10(40)A 50Hz 2000r/kw·
- 3有 不光是公式 还有一些化学符号.我要打印下来,谁有说声.千万不要有错的.
- 4将5molSO2和3molO2注入1L盛有催化剂的密闭容器中,当反应2 SO2(g)+O2(g)≈2 SO3(g)达平衡后,测得容器内共有生成4.4mol SO3
- 5The teacher told me to finish the homework carefully=The teacher told me __ __ __the homework __
- 6His mother was in the park yesterday.对in the park提问用英语怎摸说
- 7管仲巧 老马 道理
- 8can you tell me the name of the museum___you visited last month?
- 9写动物的作文50字
- 10已知ABC是锐角三角形ABC的三个内角,A,B,C的对边分别为a,b,c