1+x2+x2+x2+1+x2+4+x2+9=﹙x+1+1+x+1+1+1﹚﹙x+1+1+x+1﹚怎么算x啊
3个回答
5x²+15=(2x+5)(2x+3)
5x²+15=4x²+16x+15
x²-16x=0
x(x-16)=0
∴x1=0 x2=16
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