(2x+3y)^2-(2x+3y)(2x-3y),其中x=3,y=1.
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(2x+3y)^2-(2x+3y)(2x-3y),其中x=3,y=1.
(2x+3y)^2-(2x+3y)(2x-3y),其中x=3,y=1.
(2x+3y)^2-(2x+3y)(2x-3y),其中x=3,y=1.
(2x+3y)^2-(2x+3y)(2x-3y),
=(2x+3y)(2x+3y-2x+3y)
=6y(2x+3y)
=12xy+18y²
当x=3,y=1时
原式=36+18=54
(2x+3y)^2-(2x+3y)(2x-3y)
=(2x+3y)(2x+3y-2x+3y)
=6y(2x+3y)
当x=3,y=1时
原式=6×1×(2×3+3×1)
=54
带入,
(2x3+3x1)^2-(2x3+3x1)(2x3-3x1)=(6+3 )^2-(6+3 )(6-3 )=9^2-9x3=18-27=-9
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