(6分之5x-0.7y)(6分之5x+0.7y)
问题描述:
(6分之5x-0.7y)(6分之5x+0.7y)
答
(6分之5x)²-(0、7y)²
36分之25x²-0,49y²
(6分之5x-0.7y)(6分之5x+0.7y)
(6分之5x)²-(0、7y)²
36分之25x²-0,49y²