已知3/7x+4=3/7y+1,则(x-y)的平方-6y+7+6x的值是多少?
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已知3/7x+4=3/7y+1,则(x-y)的平方-6y+7+6x的值是多少?
已知3/7x+4=3/7y+1,则(x-y)的平方-6y+7+6x的值是多少?
已知3/7x+4=3/7y+1,则(x-y)的平方-6y+7+6x的值是多少?
3/7x+4=3/7y+1 即x-y=-7 (x-y)²+6(x-y)+7=49-42+7=14
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