来自巢明的问题
x^2+70x-1250
x^2+70x-1250
1回答
2020-09-09 22:41
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蒋珺
x^2+70x-1250
=X²+70X+1225-2475
=(X+35)²-2475
=(x+35-√2475)(x+35+√2475)
=(x+35-15√11)(x+35+15√11)
2020-09-09 22:45:43