`a)`
`(x - 3y)(x - 3y) + (x - 3y)^2`
`= (x - 3y)^2 + (x - 3y)^2`
`= 2(x - 3y)^2`
`= 2(x^2 - 6xy + 9y^2)`
`= 2x^2 - 12xy + 18y^2`
`b)`
`(x + y) + (x - y) - 4(x - y)(y + x)`
`= 2x - 4(x^2 - y^2)`
`= 2x - 4x^2 + 4y^2`
`c)`
`2x - 3y + 3x - 2y - 2(3x - 2y)(3y + 3x)`
`= 5x - 5y - 2 . 3x(3y + 3x) + 2 . 2y(3y + 3x)`
`= 5x - 5y - 18xy - 18x^2 + 12y^2 + 12xy`
`= 5x - 5y - 6xy - 18x^2 + 12y^2`
`(x-3y)(x-3y)+(x-3y)^2`
`=(x-3y)^2+(x-3y)^2`
`=2(x-3y)^2`
`=2(x^2-6xy+9y^2)`
`=2x^2-12xy+18y^2`
`(x+y)+(x-y)-4(x-y)(x+y)`
`=x+y+x-y-4(x^2-y^2)`
`=2x-4x^2+4y^2`
`2x-3y+3x-2y-2(3x-2y)(3y+3x)`
`=5x-5y-2(9xy+9x^2-6y^2-6xy)`
`=5x-5y-2(9x^2+3xy-6y^2)`
`=5x-5y-18x^2-6xy+12y^2`
Giúp mik với mik đang cần gấp .
Write full sentences using the words given : 1. When / game / online, / careful / when / you / make / friend / stranger /. => …………………………………………………………………………………………………......................................... 2. Basic tools / use / ethnic peoples / mountains / way / farming /. => ……………………………………………………………………………………………………........................................
Cho đoạn thẳng AB bằng 7 cm trên tia ab lấy điểm c sao cho Ac = 4 cm a, tính độ dài đoạn thẳng AB b, trên tia đối của tia BC lấy điểm d sao cho BD = 3 cm tính độ dài đoạn thẳng CD c, điểm d có là trung điểm của đoạn thẳng CD không vì sao
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