(1)分解因式 (x+2y)^2-(x-y)^2 (2)利用分解因式计算 (181^2-61^2)/(301^2-181^2)

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(1)分解因式 (x+2y)^2-(x-y)^2 (2)利用分解因式计算 (181^2-61^2)/(301^2-181^2)

(1)分解因式 (x+2y)^2-(x-y)^2
=(x+2y+x-y)(x+2y-x+y)
=3y(2x+y)
(2)利用分解因式计算 (181^2-61^2)/(301^2-181^2)
(181+61)(181-61)/(301-181)(301+181)
=242×120/120×482
=121/241