已知二元一次方程组{9Y=2X+1,AX+BY=9,的解也是二元一次方程组{X-18Y+14=0,2ax-3y=13.的
已知二元一次方程组{9Y=2X+1,AX+BY=9,的解也是二元一次方程组{X-18Y+14=0,2ax-3y=13.的解,求A,B的值
赞 共回答了32个问题采纳率：87.5%
9y=2x+1 ①
ax+by=9 ②
x-18y+14=0 ③
2ax-3y=13 ④
①②的解,也是③④的解,所以方程组①②③④同解
由①③得
2x-9y=-1 ⑤
x-18y=-14 ⑥
5⑤-⑥得 3x=12 x=4,
y=1
x=4,y=1代入②④
4a+b=9
8a-3=13
a=2,b=1
a,b的值分别为2,1
ax+by=9 ②
x-18y+14=0 ③
2ax-3y=13 ④
①②的解,也是③④的解,所以方程组①②③④同解
由①③得
2x-9y=-1 ⑤
x-18y=-14 ⑥
5⑤-⑥得 3x=12 x=4,
y=1
x=4,y=1代入②④
4a+b=9
8a-3=13
a=2,b=1
a,b的值分别为2,1
12
可能相似的问题
-
已知函数f(x)=sin( - x)coswx+cos已知函数f(x)=sin(pai-wx)coswx+cos平方wx
2024-05-031个回答
-
已知函数f(x)=2cos x sin(x+pai/6)-sin^2x+cos^2x.
2024-05-032个回答
-
已知函数Y=2sin^X+2sinXcosX-5cos^X 已知函数Y=2sin^X+2sinXcosX-5cos^X,
2024-05-031个回答
-
已知函数f(x)=x2+(sinα-2cosα)x+1是偶函数 则sinαcosα=
2024-05-034个回答
-
sin cos三角函数题解已知α为锐角 sinα=3cosα 求sinαcosα
2024-05-032个回答
-
刚学完三角函数,1.已知COS∝/(1+SIN∝)=A,SIN∝/(1+COS∝)=B,A-B=k(COS∝-SIN∝)
2024-05-031个回答
-
would you please tell me _ a.what to do b.how to do it c.whe
2024-05-034个回答
-
英语!英语!Please tell me_____next.A how to do B what to do it C
2024-05-037个回答
-
what will you do if you are asleep?please tell me the way to
2024-05-036个回答
-
Please tell me____to improve my English. 为什么填what to do
2024-05-035个回答
-
Would you please tell me what to do next? do 为及物动词后跟宾语,为什么wh
2024-05-032个回答
-
would you please tell me()next A how to do B what to do C wh
2024-05-031个回答
-
Could you tell me ___ to do next,please?填what还是how?
2024-05-033个回答
-
Would you please tell me __ next?A.how to do B.what to do C.
2024-05-032个回答
-
what do you want me to tell your mother Please tell her .abo
2024-05-034个回答
-
Please tell me____to improve my English.为什么填what to do
2024-05-031个回答
-
Please tell me__next?A how to do Bwhat to do C to do what D
2024-05-033个回答
-
Would you please tell me what to do it 对吗,how to do 后面可以接it吗
2024-05-031个回答
-
Please tell me what to do是一个完整的句子吗?what to do是作宾语吗
2024-05-034个回答
-
两种单质点燃生成化合物的表达式两种不同元素的原子.这两种元素分别组成的单质
2024-05-034个回答
你能帮帮他们吗
-
2024-05-042个回答
-
2024-05-041个回答
-
2024-05-041个回答
-
碳酸钙和亲氢氧化镁对人体有害吗- - 我煮的水老是有这些东西避免不了会进入体内一些哪位大虾给我开导开导哈!
2024-05-044个回答
-
正电荷与负电荷一个带正电荷的东西与一个带负电荷的东西碰在一起会怎么样?通俗一些,
2024-05-041个回答
精彩回答
-
2024-05-024个回答
-
求学霸帮忙，帮忙写一篇关于 My Summer Holiday 的作文！
2024-05-022个回答
-
2024-05-022个回答
-
2024-05-026个回答
-
2024-05-023个回答