数学计算题的1怎么做?
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x^2+3bx-a^2+ab+2b^2=0
(x+(3b/2))^2-b^2/4-a^2+ab=0
(x+(3b/2))^2-(b^2/4+a^2-ab)=0
(x+(3b/2))^2-(a-b/2)^2=0
(x+(3b/2))^2=(a-b/2)^2
(x+(3b/2))=±(a-b/2)
x=-3b/2±(a-b/2)
x1=a-2b
x2=-a-b
采纳吧
(x+(3b/2))^2-b^2/4-a^2+ab=0
(x+(3b/2))^2-(b^2/4+a^2-ab)=0
(x+(3b/2))^2-(a-b/2)^2=0
(x+(3b/2))^2=(a-b/2)^2
(x+(3b/2))=±(a-b/2)
x=-3b/2±(a-b/2)
x1=a-2b
x2=-a-b
采纳吧
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是十字相乘么?
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