作业帮消元法4x-3y=14,5x+3y=31
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消元法4x-3y=14,5x+3y=31
消元法4x-3y=14,5x+3y=31
消元法4x-3y=14,5x+3y=31
(1)中上下两式相加,得9x=45,则x=5,再带入2式子中任意式子得,y=2
（2）2×（2x-5y）=2×（-21）然后和4x+3y=23相减得出x=2,y=5
（3）上下两式相减,得12y=-36,则y=-3,x=0.5
(4)两式子左右两边分别相加得3x+5y-8=3x+y+20 则x=5,y=7
据说是上下相加耶第一个是，9x=45所以x=5
自己加油吧~~~
（x+y-5)*（x+y-5)+（x-y+3)=0 x*x-y*y
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消元法4x-3y=14,5x+3y=31
用加减消元法解下列方程组：(1)4x-3y=14,5x+3y=31(2)2x-5y=-21,4x+3y=23(3)4x+7y=-19,4x-5y=17(4)3(x-1)=y+5,5(y-1)=3(x+5)
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian
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若(-x+6):(x-y):(4x+y)=3:14:1,求x+y
若(-x+6):(x-y):(4x+y)=3:14:1,求x+y