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Lyly05
2 năm trước
bài 1 tính giá trị của biểu thức a 5x (4x^2 - 2x + 1) - 2x (10x^2 - 5x - 2) với x=15 b. 5x(x - 4y) - 4y (y - 5x) tại x= -1/5 ; y=-1/2 c. 6xy (xy - y^2) - 8x^2 (x - y^2) + 5y^2 (x^2 - xy) với x=1/2 ; y=2
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