3X(X-3) 999²-1 (2y+3X)² 5X(X+2)-(2X-2)²-X
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3X(X-3) 999²-1 (2y+3X)² 5X(X+2)-(2X-2)²-X² 123-124x122 (X-5)(X+4)
![3X(X-3) 999²-1 (2y+3X)² 5X(X+2)-(2X-2)²-X](/uploads/image/z/15037062-6-2.jpg?t=3X%EF%BC%88X-3%EF%BC%89+999%26%23178%3B-1+%EF%BC%882y%2B3X%EF%BC%89%26%23178%3B+5X%EF%BC%88X%2B2%EF%BC%89-%282X-2%29%26%23178%3B-X%26%2317)
3X(X-3)=3X²-9X
999²-1 =(999+1)(999-1)=1000*998=998000
(2y+3X)² =4Y²+12XY+9X²
5X(X+2)=5X²+10X
-(2X-2)²-X² =-(2X-2+X)(2X-2-X)=(3X-2)(2-X)
123²-124x122 =123²-(123+1)(123-1)=123²-123²+1=1
(X-5)(X+4)=X²-X-20
999²-1 =(999+1)(999-1)=1000*998=998000
(2y+3X)² =4Y²+12XY+9X²
5X(X+2)=5X²+10X
-(2X-2)²-X² =-(2X-2+X)(2X-2-X)=(3X-2)(2-X)
123²-124x122 =123²-(123+1)(123-1)=123²-123²+1=1
(X-5)(X+4)=X²-X-20
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