计算:(1)(3a+2b)(-3a-2b)(2)(0.5a+3分之1b)²(3)(-8b+4分之1)²

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计算:(1)(3a+2b)(-3a-2b)(2)(0.5a+3分之1b)²(3)(-8b+4分之1)²
计算:(1)(3a+2b)(-3a-2b)(2)(0.5a+3分之1b)²
(3)(-8b+4分之1)²

计算:(1)(3a+2b)(-3a-2b)(2)(0.5a+3分之1b)²(3)(-8b+4分之1)²
1.(3a+2b)(-3a-2b)=-(3a+2b)(3a+2b)=-(3a+2b)²
2.(0.5+b/3)²=(1/2+b/3)²=(3+2b)²/36
3.(-8b+1/4)²=(8b-1/4)²=(32b-1)²/16

  1.(3a+2b)(-3a-2b)=-(3a+2b)(3a+2b)=-(3a+2b)²=-9a²-12ab-4b²
  2.(0.5+b/3)²=(1/2+b/3)²=﹙1/4﹚+﹙1/3﹚b+﹙1/9﹚b²
  3.(-8b+1/4)²=(8b-1/4)²=64b²-4b+1/16