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ericnguyen3124
2 năm trước
"Những hằng đẳng thức đáng nhớ": 1, Tính (bỏ dấu ngoặc) a, (x+2y)^2 b, (3x-1).(3x+1) c, (2x-y)^2 d, (1/2x+y).(1/2x-y) CTLHN luôn @@
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