如图!
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如图!
如图!
如图!
(1)原式=(1/36)(9a²+12ab+4b²)=(3a+2b)²/36
(2)原式=(a²-b²)²=(a+b)²(a-b)²
(3)原式=[(x²+2x)+1]²=(x²+2x+1)²=(x+1)^4
(4)原式=[7(m+n)+4(m-n)][7(m+n)-4(m-n)]
=[7m+7n+4m-4n][7m+7n-4m+4n]
=(11m+3n)(3m+11n)