已知x+2y=6,2x-3y=-2,求2x+4y/2+6x-9y/3的值已知{x+2y=6,{2x-3y=-2,求2x+4y/2+6x-9y/3的值已知{x+2y=6,{2x-3y=-2,求2x+4y + 6x-9y/的值——— ———2 3 就是这个意思嘛
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