因式分解:49(a-b)²-16(a+b)²
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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:49(a-b)²-16(a+b)²:49(
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:49(a-b)²-16(a+b)²
:49(a-b)²-16(a+b)²
=[7(a-b)+4(a+b)][7(a-b)-4(a+b)]
=(7a-7b+4a+4b)(7a-7b-4a-4b)
=(11a-3b)(3a-11b);
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49(a-b)²-16(a+b)²
=[7(a-b)]²-[4(a+b)]²
=[7(a-b)+4(a+b)]×[7(a-b)-4(a+b)]
=(11a-3b)(3a-11b)
49(a-b)²-16(a+b)²
=[7(a-b)]²-[4(a+b)]²
={[7(a-b)]-[4(a+b)]}{[7(a-b)]+[4(a+b)]}
=(3a-11b)(11a-3b)