(2x-y)2-x(x-2y)-y2
=4x2-4xy+y2-x2+2xy-y2
=3x2-2xy
∵3x=2y
∴原式=3x•x-2xy
=2xy-2xy
=0.
已知:3x=2y,求代数式(2x-y)2-x(x-2y)-y2的值.
已知:3x=2y,求代数式(2x-y)2-x(x-2y)-y2的值.
数学人气:107 ℃时间:2019-08-19 11:22:30
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