(80+x)(50+2x)=5400.
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(80+x)(50+2x)=5400.
(80+x)(50+2x)=5400.
(80+x)(50+2x)=5400.
(80+X)(50+2X)=5400 (把前面的乘法开)
4000+160X+50X+2X^2=5400
2X^2+210X-1400=0
X^2+105X-700=0
X^2+105X+(105/2)^2=700+(105/2)^2
(X+105/2)^2=3456.25
后面开方就是啦 !
(x+80)(x+25)=2700
x²+105x-700=0
x=(-105±5√553)/2
(80+x)(50+2x)=5400.
300字读后感 2篇 俄把格式说一下吧:《xxxx》(写题目)主要内容:x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x(写那篇文章的主要内容)思考分析:x x x
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