填空:(一)20x^2+()+14y^2=(4x-7y)(5x-2y) (二)x^2-3xy-()=(x-7y)(x+4y)(一)20x^2+()+14y^2=(4x-7y)(5x-2y)(二)x^2-3xy-()=(x-7y)(x+4y)(三)x^2+()-28y^2=(x+7y)(x-4y)(四)x^2+()-21y^2=(x-7y)(x+3y)
来源:学生作业帮助网 编辑:作业帮 时间:2024/09/18 21:32:11
填空:(一)20x^2+()+14y^2=(4x-7y)(5x-2y) (二)x^2-3xy-()=(x-7y)(x+4y)(一)20x^2+()+14y^2=(4x-7y)(5x-2y)(二)x^2-3xy-()=(x-7y)(x+4y)(三)x^2+()-28y^2=(x+7y)(x-4y)(四)x^2+()-21y^2=(x-7y)(x+3y)
填空:(一)20x^2+()+14y^2=(4x-7y)(5x-2y) (二)x^2-3xy-()=(x-7y)(x+4y)
(一)20x^2+()+14y^2=(4x-7y)(5x-2y)
(二)x^2-3xy-()=(x-7y)(x+4y)
(三)x^2+()-28y^2=(x+7y)(x-4y)
(四)x^2+()-21y^2=(x-7y)(x+3y)
填空:(一)20x^2+()+14y^2=(4x-7y)(5x-2y) (二)x^2-3xy-()=(x-7y)(x+4y)(一)20x^2+()+14y^2=(4x-7y)(5x-2y)(二)x^2-3xy-()=(x-7y)(x+4y)(三)x^2+()-28y^2=(x+7y)(x-4y)(四)x^2+()-21y^2=(x-7y)(x+3y)
-43xy
28y^2
3xy
-4xy
(一)20x^2+(-43xy)+14y^2=(4x-7y)(5x-2y)
(二)x^2-3xy-(28y²)=(x-7y)(x+4y)
(三)x^2+(3xy)-28y^2=(x+7y)(x-4y)
(四)x^2+(-4xy)-21y^2=(x-7y)(x+3y)
(1)-43xy
(2)28y^2
(3)3xy
(4)-4xy