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ngtram
2 năm trước
thu gọn các biểu thức sau : 1.(7x+4)^2 -(7x+4)(7x-4) 2.(3x+y)(9x^2-3xy+y^2)-(3x-y)^3-27x^2y 3.(x+2y)^3-6xy(x+2y) 4.x(x+4)(x-4)-(x^2+1)(x^2-1) 5.(y-3)(y+3)(y^2+9)-(y^2+2)(y^2-2) 6.(a+b+c)^2-(a-c)^2-2ab +2bc mn giải chi tiết nha ,mk cảm ơn nhìu
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