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minhkhoa674
2 năm trước
Rút gọn đẳng thức A= ( x+2) ^2 - ( x-2) ^ 2 - 5 ( x+ 1) ( x-4) + 5 B= ( x+ 1) ^ 2 + ( x-1 ) ^ 2 - 2 ( x-1 ) ( x+1) C= 7 ( x-1) ( x+1) -6 ( x-1)^2 - ( 2+x) ^ 2
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