解方程组 {3(x+y)-4(x-y)=11 {2(x-y)+5(x+y)=27全过程、快
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解方程组 {3(x+y)-4(x-y)=11 {2(x-y)+5(x+y)=27全过程、快
解方程组 {3(x+y)-4(x-y)=11 {2(x-y)+5(x+y)=27全过程、快
解方程组 {3(x+y)-4(x-y)=11 {2(x-y)+5(x+y)=27全过程、快
方程化为 -x+7y=11 1
7x+3y=27 2
将1式化为 x=7y-11 3
则将3式代入2式可得 7(7y-11)+3y=27
52y=104 y=2
x=7×2-11 x=3
所以解得 x=3 y=2
3(x+y)-4(x-y)=11 2(x-y)+5(x+y)=27
7y-x=11 ① 3y+7x=27②
①7×+②,得
56y=104
y=2
将y=2带入①得
14-x=11
x=3
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