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149163789972513
2 năm trước
Rút gọn biểu thức a, 7x(4x-2)-(x-3)(x-1)+16x b, (2x+y)^2+(x-y)^2-5(x+y)(x-y) c, (x+y-z)^2+(y-z)^2+2(x-y+z)(z-y)
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