{3x+5y=19 4x-3y=6 用加减法
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{3x+5y=19 4x-3y=6 用加减法
{3x+5y=19 4x-3y=6 用加减法
{3x+5y=19 4x-3y=6 用加减法
3x+5y=19 ①
4x-3y=6 ②
①x4-②x3得:29y=58
y=2 ③
③带入②得:4x-3x2=6
x=3
解方程组 3x加2y加5z=2 x-2y-z=6 4x加2y-7z=30
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x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
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