(30-x)(20-x)=551怎么解,
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(30-x)(20-x)=551怎么解,
(30-x)(20-x)=551怎么解,
(30-x)(20-x)=551怎么解,
(30-x)(20-x)=551
600-50x+x²=551
x²-50x+49=0
(x-49)(x-1)=0
x1=49 x2=1
先展开即
600-50x+x2=551
X2-50x+49=0
(x-1)(x-49)=0,即x=1或49
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