(4x-3y)(5x+2y)-2x(9x-5y) 等于多少
来源:百度知道 编辑:UC知道 时间:2024/06/24 10:10:27
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(4x-3y)(5x+2y)-2x(9x-5y)
=20x^2+8xy-15xy-6y^2-18x^2+10xy
=2x^2+3xy-6y^2
=20x^2+8xy-15xy-6y^2-18x^2+10y^2
=2x^2-7xy+4y^2
上面^是平方的意思
=4x*5x+4x*2y-3y*5x-3y*2y-2x*9x+2x*5y
=20x+8xy-15xy-6y平方-18x平方+10xy
=20x+3xy-6y平方-18x平方
(4x-3y)(5x+2y)-2x(9x-5y)
=20x²+8xy-15xy-6y²-18x²+10xy
=2x²-3xy-6y²
(4x-3y)(5x+2y)-2x(9x-5y)
=20x^2+8xy-15xy-6y^2-18x^2+10xy
=2x^2+3xy-6y^2
3(x+y)(x-y)+4(x-y)^2=?
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