因式分解-1/9 X^2+4/49 Y^2
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因式分解-1/9X^2+4/49Y^2因式分解-1/9X^2+4/49Y^2因式分解-1/9X^2+4/49Y^2(-1/3x+2/7y)(1/3x+2/7y)-1/9X^2+4/49Y^2=4/49
因式分解-1/9 X^2+4/49 Y^2
因式分解-1/9 X^2+4/49 Y^2
因式分解-1/9 X^2+4/49 Y^2
(-1/3x+2/7y)(1/3x+2/7y)
-1/9 X^2+4/49 Y^2
=4/49 Y^2-1/9 X^2
=(2/7Y)^2-(1/3X)^2
=(2/7Y+1/3X)(2/7Y-1/3X)
因式分解-1/9 X^2+4/49 Y^2
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