(7x^2+2y^2)^2-(2x^2+7y^2)^2和(x+2y)^2-y^2用分解因式怎么解啊,谁能帮下我,有分的
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(7x^2+2y^2)^2-(2x^2+7y^2)^2和(x+2y)^2-y^2用分解因式怎么解啊,谁能帮下我,有分的(7x^2+2y^2)^2-(2x^2+7y^2)^2和(x+2y)^2-y^2用
(7x^2+2y^2)^2-(2x^2+7y^2)^2和(x+2y)^2-y^2用分解因式怎么解啊,谁能帮下我,有分的
(7x^2+2y^2)^2-(2x^2+7y^2)^2和(x+2y)^2-y^2用分解因式怎么解啊,谁能帮下我,有分的
(7x^2+2y^2)^2-(2x^2+7y^2)^2和(x+2y)^2-y^2用分解因式怎么解啊,谁能帮下我,有分的
(7x^2+2y^2)^2-(2x^2+7y^2)^2
=49x^2+4y^4+28x^2y^2-4x^4-28x^2y^2-49y^4
=45x^2-45y^2
=45(x^2-y^2)
(x+2y)^2-y^2
=x^2+4xy+4y^2-y^2
=x^2+4xy+3y^2
=(x+y)(x+3y)
用平方差公式分解,具体要你自己去做,否则,你就不会掌握。
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