①若x+y=3,xy=2,则(5a+2)- (3xy-5y)=②(a+b-c)(a-b+c)=【a+()】【a-()】 求括号里的值
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![①若x+y=3,xy=2,则(5a+2)- (3xy-5y)=②(a+b-c)(a-b+c)=【a+()】【a-()】 求括号里的值](/uploads/image/z/11701474-34-4.jpg?t=%E2%91%A0%E8%8B%A5x%2By%3D3%2Cxy%3D2%2C%E5%88%99%EF%BC%885a%2B2%EF%BC%89-+%EF%BC%883xy-5y%EF%BC%89%3D%E2%91%A1%EF%BC%88a%2Bb-c%EF%BC%89%EF%BC%88a-b%2Bc%EF%BC%89%3D%E3%80%90a%2B%EF%BC%88%EF%BC%89%E3%80%91%E3%80%90a-%EF%BC%88%EF%BC%89%E3%80%91+%E6%B1%82%E6%8B%AC%E5%8F%B7%E9%87%8C%E7%9A%84%E5%80%BC)
①若x+y=3,xy=2,则(5a+2)- (3xy-5y)=②(a+b-c)(a-b+c)=【a+()】【a-()】 求括号里的值
①若x+y=3,xy=2,则(5a+2)- (3xy-5y)=
②(a+b-c)(a-b+c)=【a+()】【a-()】 求括号里的值
①若x+y=3,xy=2,则(5a+2)- (3xy-5y)=②(a+b-c)(a-b+c)=【a+()】【a-()】 求括号里的值
①若x+y=3,xy=2,则(5x+2)- (3xy-5y)
=5(x+y)-3xy+2
=11
②(a+b-c)(a-b+c)=【a+(b-c)】【a-(b-c)】
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