化简：2x(2x-3y)-3y(x+y)

来源：学生作业帮助网 编辑：作业帮 时间：2024/04/27 03:34:02

化简：2x(2x-3y)-3y(x+y)
化简：2x(2x-3y)-3y(x+y)

化简：2x(2x-3y)-3y(x+y)
2x(2x-3y)-3y(x+y)
=4x²-6xy-3xy-3y²
=4x²-9xy-3y²


原式
=4x²-6xy-3xy-3y²
=4x²-9xy-3y²

x=1.25,y=-0.25
所以x+y=1
1/7(-2x+3y)(-2x-3y)-10(x+y)^2
=1/7[(-2x)^2-(3y)^2]-10*1^2
=1/7(4x^2-9y^2)-10
=1/7[4*(5/4)^2-9*(-1/4)^2]-10
=1/7(25/4-9/16)-10
=(1/7)*(91/16)-10
=13/16-10
=-147/16
希望对你能有所帮助。

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