m/2+n/3=7 ----------(1)
m/3-n/4=-7 ----------(2)
(1)式*6得
3m+2n=42----------(3)
(2)式*12得
4m-3n=-84---------(4)
(3)式*3+（4）式*2得
17m=-42
m=-42/17
n=24又12/17
|m|=3,|n|=7,則|m+n|等于
|m|=3,|n|=7,則|m+n|等于
數(shù)學(xué)人氣：769 ℃時(shí)間：2019-08-26 07:57:32
優(yōu)質(zhì)解答
我來(lái)回答
類似推薦
- 如果m的1/3等于n的2/7那么m:n=():()
- m(m-n)-n(n-m)=7為什么m(m-n)+n(m-n)=7也等于7
- 如果m分之n等于7分之6,那么n×（ ）=m×（ ）
- a^m除a^n除a^7等于?
- (m-n+3)(m+n-2)等于多少
- 函數(shù)f(x)=sinx-cosx^2的最小值是?
- 英語(yǔ)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(shuō)明書(shū)
- 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