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如何计算它的周长?

如何计算它的周长?. 去括号:. 5a + (6x - 7y - 4a) 3x - (4y - 5x + 2). 添括号:. 5a 2 + 3a + b=5a 2 - (____________) - x + 2y + x 2 - 4y 2 = - (________ ) + (_________). 解: a + 6x - 7y 解: 8x - 4y - 2. - 3a - b. x 2 + 2y. 4y 2 + x. 求单项式 5x 2 y ,- 2x 2 y , 2xy 2 ,- 4x 2 y 的和.

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如何计算它的周长?

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  1. 如何计算它的周长?

  2. 去括号: 5a+(6x-7y-4a) 3x-(4y-5x+2) 添括号: 5a2+3a+b=5a2-(____________) -x+2y+x2-4y2=-(________ )+(_________) 解:a+6x-7y 解:8x-4y - 2 - 3a - b x2+2y 4y2 + x

  3. 求单项式5x2y,-2x2y,2xy2,-4x2y的和 算式一:5x2y+(-2x2y)+2xy2+(-4x2y) (按字面意思规范写) 算式二:5x2y-2x2y+2xy2-4x2y (求代数和的形式) 5x2y+(-2x2y)+2xy2+(-4x2y)   =5x2y-2x2y+2xy2-4x2y   =5x2y-2x2y-4x2y+2xy2    =-x2y+2xy2

  4. 整式加减运算步骤如下: 1.如果遇到括号,按去括号法则先去括号; 2.合并同类项。

  5. 哪一种正确 求整式 2x2-7x-2 与 x2+4x-1 的差. • (2x2-7x-2)-(x2+4x-1) • 2x2-7x-2-x2+4x-1 • (3) 2x2-7x-2-x2-4x+1

  6. 求2x2+xy+3y2与x2-xy+2y2的差。 解: (2x2+xy+3y2)-(x2-xy+2y2) =2x2+xy+3y2-x2+xy-2y2=x2+2xy+y2

  7. 内容丰富的数——0 http://web.stedu.net/web/g0004cch/slmq/0youlai.htm

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