3x*3x+2xy=8 2x*2x+3xy=7 你能求出10x*10x+10xy+8的值
来源:百度知道 编辑:UC知道 时间:2024/06/01 09:04:09
解:设m(3x*3x+2xy)+n(2x*2x+3xy)=10x*10x+10xy
(9m+4n-100)x*x+( 2m+3n-10)xy=0
那么9m+4n=100
2m+3n=10
解得:m=260/19
n=-110/19
10x*10x+10xy+8=m(3x*3x+2xy)+n(2x*2x+3xy)+8
=260/19×8-110/19×7+8
=1462/19
27x²+6xy=24 (1)
8x²+6xy=14 (2)
(1)-(2) 得: 19x²=10
x²=10/19
得: xy=31/19
100x²+10xy+8
=1000/19+310/19+8
=1462/19
=76.947
27x²+6xy=24
8x²+6xy=14
相减得19x²=10
x²=10/19
代入得xy=41/19
100x²+10xy+8
=1000/19+410/19+8
=1562/19
设m(3x*3x+2xy)+n(2x*2x+3xy)=10x*10x+10xy
那么9m+4n=100
2m+3n=10
解出m,n,即可求出
你自己去解吧,没纸
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