49(a+b)²-16(a-b)²因式分解

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49(a+b)²-16(a-b)²因式分解49(a+b)²-16(a-b)²因式分解49(a+b)²-16(a-b)²因式分解=[7(a+b

49(a+b)²-16(a-b)²因式分解
49(a+b)²-16(a-b)²因式分解

49(a+b)²-16(a-b)²因式分解
=[7(a+b)+4(a-b)][7(a+b)-4(a-b)]
=(11a+3b)(3a+11b)

[7(a+b)]²-[4(a-b)²]=(11a+3b)(3a+11b)