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tuanvutruongminh
2 năm trước
1 rút gọn rồi tính a) (x-10)²-x(x+80) b) (2x+9)²-x(4x+31) c) (5+x)(5-x)+3x(1/3x+1) 2 viết dưới dạng tích a) (x+y+z)²-(y+z)² b) (x+3)²+4(x+3)+4
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