数学题 好的加分
(1)(3x+1)(2x-3)-2(x-1)(x+3)(2)(¼a-1)(¼a+1)(3)(-3a-½b)(3a-½...
(1)(3x+1)(2x-3)-2(x-1)(x+3)
(2)(¼a-1)(¼a+1)
(3)(-3a-½b)(3a-½b)
(4)(-a-b)²
(5)(2x-y-3)²
(6)(a-2+b)(a+b+2) 展开
(2)(¼a-1)(¼a+1)
(3)(-3a-½b)(3a-½b)
(4)(-a-b)²
(5)(2x-y-3)²
(6)(a-2+b)(a+b+2) 展开
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(1)(3x+1)(2x-3)-2(x-1)(x+3)
=6x^2-7x-3-(2x^2-4x-6)=4x^2-3x+3
(2)(¼a-1)(¼a+1)=1/2a-1
(3)(-3a-½b)(3a-½b)=b-9a^2
(4)(-a-b)²=a^2-2ab+b^2
(5)(2x-y-3)²=4x^2+y^2+9-4xy-12x+6y
(6)(a-2+b)(a+b+2)=(a+b)^2-4=a^2+2ab+b^2-4
=6x^2-7x-3-(2x^2-4x-6)=4x^2-3x+3
(2)(¼a-1)(¼a+1)=1/2a-1
(3)(-3a-½b)(3a-½b)=b-9a^2
(4)(-a-b)²=a^2-2ab+b^2
(5)(2x-y-3)²=4x^2+y^2+9-4xy-12x+6y
(6)(a-2+b)(a+b+2)=(a+b)^2-4=a^2+2ab+b^2-4
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