问几个八上数学乘法平方差完全平方差公式的题会几个答几个1.(a+b+1)(a+b-1)2.(abc+d)(abc-d)3.(x^4+1)(x²+1)(x+1)(x-1)4.(5x-3)(5x+3)-3x(3x-7)5.(﹣2/1a-b)(2/1a-b)6.(a+1)&#

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问几个八上数学乘法平方差完全平方差公式的题会几个答几个1.(a+b+1)(a+b-1)2.(abc+d)(abc-d)3.(x^4+1)(x²+1)(x+1)(x-1)4.(5x-3)(5x+3)-3x(3x-7)5.(﹣2/1a-b)(2/1a-b)6.(a+1)&#
问几个八上数学乘法平方差完全平方差公式的题会几个答几个
1.(a+b+1)(a+b-1)
2.(abc+d)(abc-d)
3.(x^4+1)(x²+1)(x+1)(x-1)
4.(5x-3)(5x+3)-3x(3x-7)
5.(﹣2/1a-b)(2/1a-b)
6.(a+1)²-(a-1)²
7.(4+x)²-(4+x)(-x+4)
8.(3x+2)(3x-2)-5x(x-1)-(2x-1)²其中x=-3/1
急 分都给你了

问几个八上数学乘法平方差完全平方差公式的题会几个答几个1.(a+b+1)(a+b-1)2.(abc+d)(abc-d)3.(x^4+1)(x²+1)(x+1)(x-1)4.(5x-3)(5x+3)-3x(3x-7)5.(﹣2/1a-b)(2/1a-b)6.(a+1)&#
1.(a+b+1)(a+b-1)=(a+b)^2-1=a^2+2ab+b^2-1
2.(abc+d)(abc-d)=(abc)^2-d^2=a^2b^2c^2-d^2
3.(x^4+1)(x²+1)(x+1)(x-1)=(x^4+1)(x²+1)(x²-1)=(x^4+1)(x^4-1)=x^8-1
4.(5x-3)(5x+3)-3x(3x-7)=25x^2-9-9x^2+21x=16x^2+21x-9
5.(﹣2/1a-b)(2/1a-b)=b^2-1/4a^2 (应该是1/2吧)
6.(a+1)²-(a-1)²=4a
7.(4+x)²-(4+x)(-x+4)=16+8x+x^2-16+x^2=2x^2+8x
8.(3x+2)(3x-2)-5x(x-1)-(2x-1)²=9x^2-4-5x^2+5x=4x^2+5x-4
=4/9-5/3-4=-23/3

1.(a+b)²-1
2.(abc)²-d²
3.(x^4+1)(x²+1)(x+1)(x-1)=(x∧4+1)(x²+1)(x²-1)=(x∧4+1)(x∧4-1)=x∧8-1
5.