3X(X-3) 999²-1 (2y+3X)² 5X(X+2)-(2X-2)²-X
来源:学生作业帮 编辑:神马作文网作业帮 分类:数学作业 时间:2024/10/09 23:16:04
3X(X-3) 999²-1 (2y+3X)² 5X(X+2)-(2X-2)²-X² 123-124x122 (X-5)(X+4)
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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