1. 9(A+B)^2-4(A-B)^2 因式分解
=(3A+3B+2A-2B)(3A+3B-2A+2B)
=(5A+B)(A+5B)
2. 16(A-B)^2-9(A+B)^2 因式分解
=(4A-4B+3A+3B)(4A-4B-3A-3B)
=(7A-B)(A-7B)
1. 9(A+B)^2-4(A-B)^2
=[3(A+B)-2(A-B)][3(A+B)+2(A-B)]
=(A+5B)(5A+B)
2. 16(A-B)^2-9(A+B)^2
=[4(A-B)+3(A+B)][4(A-B)-3(A+B)]
=(7A-B)(A-7B)
1. 9(A+B)^2-4(A-B)^2
=[3(A+B)]^2-[2(A-B)]^2
=[3(A+B)+2(A-B)]*[3(A+B)-2(A-B)]
=(5A-B)(A+5B)
2. 16(A-B)^2-9(A+B)^2
=[4(A-B)]^2-[3(A+B)]62
=[4(A-B)+3(A+B)]*[4(A-B)-3(A+B)]
=(7A-B)(A-7B)
1、9(A+B)^2-4(A-B)^2
=[3(A+B)]²-[2(A-B)]²
=[3(A+B)+2(A-B)][3(A+B)-2(A-B)]
=(3A+3B+2A-2B)(3A+3B-2A+2B)
=(5A+B)(A+5B)
2、16(A-B)^2-9(A+B)^2
=[4(A-B)]²-[3(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)