16(a-b)²-9(a+b)² (a+b+c)²-(a+b-c)² 4a²-(b+c)²这是三个题
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16(a-b)²-9(a+b)² (a+b+c)²-(a+b-c)² 4a²-(b+c)²这是三个题
16(a-b)²-9(a+b)² (a+b+c)²-(a+b-c)² 4a²-(b+c)²
这是三个题
16(a-b)²-9(a+b)² (a+b+c)²-(a+b-c)² 4a²-(b+c)²这是三个题
16(a-b)²-9(a+b)²
=[4(a-b)+3(a+b)][4(a-b)-3(a+b)]
=(4a-4b+3a+3b)(4a-4b-3a-3b)
=(7a-b)(a-7b)
(a+b+c)²-(a+b-c)²
= (a+b+c+a+b-c)(a+b+c-a-b+c)
= (2a+2b)(2c)
=4c(a+b)
4a²-(b+c)²
=(2a)²-(b+c)²
=(2a+b+c)(2a-b-c)