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nguyensam1402
2 năm trước
`a)` Tính giá trị biểu thức sau biết ` x + y + 1 = 0`: `N = x^2(x +y) - y^2(x +y)+ x^2 - y^2 + 2(x +y) +3` `b)` Tính giá trị biểu thức $\dfrac{5x-4y}{3x - 2y}$ biết $\dfrac{x}{14}$ `=`$\dfrac{y}{15}$ Help vs ak!!
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