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9(a-b)²+12(a²-b²)+4(a+b)²a³-10a²+25ax²
题目内容:
9(a-b)²+12(a²-b²)+4(a+b)²
a³-10a²+25a
x²+2x+1-y²
25(m+n-3)²-9(3m-2n)²优质解答
9(a-b)²+12(a²-b²)+4(a+b)²=(3(a-b))+2*3*2(a+b)(a-b)+(2(a+b))²=(3(a-b)+2(a+b))²=(5a-b)²a³-10a²+25a=a(a²-2*5*a+5²)=a(a-5)²x²+2x+1-y²=...
a³-10a²+25a
x²+2x+1-y²
25(m+n-3)²-9(3m-2n)²
优质解答
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