(x-3y)²-4x² 9分之1m²+1+3分之2M
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(x-3y)²-4x² 9分之1m²+1+3分之2M
(x-3y)²-4x² 9分之1m²+1+3分之2M
(x-3y)²-4x² 9分之1m²+1+3分之2M
(x-3y)²-4x²
=(x-3y)²-(2x)²
=[(x-3y)+2x] [(x-3y)-2x]
=(3x-3y) (-x-3y)
=-3(x-y)(x+3y)
9分之1m²+1+3分之2m
=(m/3)²+1²+2*3/m
=(m/3+1)²