已知x+y=16/21,x-y=3/8,求代數(shù)式x²-y²的值
已知x+y=16/21,x-y=3/8,求代數(shù)式x²-y²的值
其他人氣：804 ℃時(shí)間：2020-05-13 04:01:59
優(yōu)質(zhì)解答
x²-y²=(x-y)(x+y)=16/21x(3/8)=2/7
我來回答
類似推薦
- 如果x+y=-4,x-y=8,那么代數(shù)式x²-y²的值
- 已知代數(shù)式y(tǒng)²-2y的值為5,那么代數(shù)式3y²-6y-21的值為?
- 若x-y=6,xy=-8,求代數(shù)式(x+y+z)²+(x-y-z)(x-y+z)-2·z(x+y)的值
- 已知方程組x+y=8,3x-4y=10的解為x=-3a,y=b求代數(shù)式3a-b²的值
- 下列關(guān)于代數(shù)式x²-4x+8的三個(gè)命題
- 函數(shù)f(x)=sinx-cosx^2的最小值是?
- 英語翻譯
- I took my grandpa to the hospital this morning,_____ I missed the first class.
- So crazy
- 方差是各個(gè)數(shù)據(jù)與平均數(shù)之差的平方的平均數(shù)
- 函數(shù)y=f(x)與它反函數(shù)y=f^-1(x)怎么讀?
- These are photos of my families.Look at them 改錯(cuò)
猜你喜歡
- 1平面與平面重合,是否屬于平行一類?那重合的兩直線,也屬于平行一類的嗎?
- 2非洲每年因饑餓死亡的人數(shù)及現(xiàn)在饑餓人口數(shù)量拜托各位了 3Q
- 3decide to do sth.還=什么
- 4(7/8)o you think of london?B:5.____london is one of the liveliest cities
- 5啤酒可以托運(yùn)嗎
- 6邊長(zhǎng)為2√6的等邊三角形的中心到一邊的距離為?
- 7please give your hand to help me
- 8已知2的X次方等于3的Y次方等于6的Z次方不等等于1,證明X分之一加Y分之一等于Z分之一.
- 9幫我做做?
- 10機(jī)械分析天平TG628A的使用說明書
- 11in winter ,we wear warm coats to protect our bodies_.
- 12( )was most importance to her ,she told me,was her family it this what as