(40-x)(60+x/5*30)=3600解答

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(40-x)(60+x/5*30)=3600解答(40-x)(60+x/5*30)=3600解答(40-x)(60+x/5*30)=3600解答(40-x)(60+6x)=3600两边除以-6(x+1

(40-x)(60+x/5*30)=3600解答
(40-x)(60+x/5*30)=3600
解答

(40-x)(60+x/5*30)=3600解答
(40-x)(60+6x)=3600
两边除以-6
(x+10)(x-40)=-600
x²-30x+200=0
(x-10)(x-20)=0
x=10,x=20