解方程组：①3x+4y=19；x-y=4②x-y=3；2y+3（x-y）=11③x/2-y + 1/3=1；3x+2y=10
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解方程组：①3x+4y=19；x-y=4②x-y=3；2y+3（x-y）=11③x/2-y+1/3=1；3x+2y=10解方程组：①3x+4y=19；x-y=4②x-y=3；2y+3（x-y）=11③
解方程组：①3x+4y=19；x-y=4②x-y=3；2y+3（x-y）=11③x/2-y + 1/3=1；3x+2y=10
解方程组：①3x+4y=19；x-y=4②x-y=3；2y+3（x-y）=11③x/2-y + 1/3=1；3x+2y=10
解方程组：①3x+4y=19；x-y=4②x-y=3；2y+3（x-y）=11③x/2-y + 1/3=1；3x+2y=10
①由x-y=4,得 x=y+4 ②将x-y=3代入2y+3(x-y)=11 ③由x/2-y+1/3=1,得
代入3x+4y=19,得 得 2y+3×3=11 则 y=1 y=x/2-2/3
3(y+4)+4y=19 由x-y=1,得 x=y+3=4 代入3x+2y=10,得
∴ y=1,则x=y+4=5 ∴ x=4,y=1 3x+2(x/2-2/3)=10
∴ x=5,y=1 x=17/6 y=3/4
X=31/7 Y=3/7 X=-2 Y=-5 X=17/6 Y=3/4
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解方程组：①3x+4y=19；x-y=4②x-y=3；2y+3（x-y）=11③x/2-y + 1/3=1；3x+2y=10
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