计算,1.(2b+3a)(3a-2b) 2.(x+y-z)(x-y-z) 3.(3x-2)(2-3x)1.(2b+3a)(3a-2b)2.(x+y-z)(x-y-z)3.(3x-2)(2-3x)
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计算,1.(2b+3a)(3a-2b)2.(x+y-z)(x-y-z)3.(3x-2)(2-3x)1.(2b+3a)(3a-2b)2.(x+y-z)(x-y-z)3.(3x-2)(2-3x)计算,1.
计算,1.(2b+3a)(3a-2b) 2.(x+y-z)(x-y-z) 3.(3x-2)(2-3x)1.(2b+3a)(3a-2b)2.(x+y-z)(x-y-z)3.(3x-2)(2-3x)
计算,1.(2b+3a)(3a-2b) 2.(x+y-z)(x-y-z) 3.(3x-2)(2-3x)
1.(2b+3a)(3a-2b)
2.(x+y-z)(x-y-z)
3.(3x-2)(2-3x)
计算,1.(2b+3a)(3a-2b) 2.(x+y-z)(x-y-z) 3.(3x-2)(2-3x)1.(2b+3a)(3a-2b)2.(x+y-z)(x-y-z)3.(3x-2)(2-3x)
解
(2b+3a)(3a-2b)
=(3a)²-(2b)²
=9a²-4b²
(x+y-z)(x-y-z)
=[(x-z)+y][(x-z)-y]
=(x-z)²-y²
=x²-2zx+z²-y²
(3x-2)(2-3x)
=-(3x-2)²
=-(9x²-12x+4)
=-9x²+12x-4
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