(cănx/2 - 1/2canx)^2 × (cănx-1/cănx+1-cănx+1/cănx-1) Rút gọn bt

(cănx/2 - 1/2canx)^2 × (cănx-1/cănx+1-cănx+1/cănx-1) Rút gọn bt
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