35x-17y=59 7x-5y=-9方程组怎么解今晚就得用!
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35x-17y=59 7x-5y=-9方程组怎么解今晚就得用!
35x-17y=59 7x-5y=-9方程组怎么解
今晚就得用!
35x-17y=59 7x-5y=-9方程组怎么解今晚就得用!
35x-17y=59 .1
7x-5y=-9.2
2式×5:35x-25y=-45.3
1式-3式:8y=104
解得y=13
代入1式,得x=8
35x-17y=59---(1),
7x-5y=-9 ------>7X=5Y-9代入(1)
5*(5Y-9)-17y=59
y=13,
x=8
35x-17y=59 ----(1)
7x-5y=-9 -----(2)
(1)-5*(2)
=>35x-17y-5*(7x-5y)=59+5*(-9)=104 =>y=13 代入(1)=>x=8
故答案为x=8,y=13
设35x-17y=59 为1式,7x-5y=-9为2式,1式-2式*5得8Y=14,所以Y=1.75.X=71/28
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