2x+y=6m……①3x-2y=2m……②用①×2 +②得 （4x+2y)+(3x-2y)=12m+2m7x =14m故x=2m用①×3 -②×2得(6x+3y)-(6x -4y)=18m-4m7y=14m故 y=2m代入x/3-y/5=4得 2m/3 - 2m/5 =4各项乘以1510m-6m=604m=60m=15
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