(80x200)+(80-x)(200+10x)+40(800-200-200-10x)=9000+(50x800) 怎么解
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![(80x200)+(80-x)(200+10x)+40(800-200-200-10x)=9000+(50x800) 怎么解](/uploads/image/z/1631753-17-3.jpg?t=%2880x200%29%2B%2880-x%29%28200%2B10x%29%2B40%28800-200-200-10x%29%3D9000%2B%2850x800%29+%E6%80%8E%E4%B9%88%E8%A7%A3)
(80x200)+(80-x)(200+10x)+40(800-200-200-10x)=9000+(50x800) 怎么解
(80x200)+(80-x)(200+10x)+40(800-200-200-10x)=9000+(50x800) 怎么解
(80x200)+(80-x)(200+10x)+40(800-200-200-10x)=9000+(50x800) 怎么解
(80x200)+(80-x)(200+10x)+40(800-200-200-10x)=9000+(50x800)
16000+(80-x)(200+10x)+40(400-10x)=9000+40000
16000+(80-x)(200+10x)+40(400-10x)=49000
(80-x)(200+10x)+40(400-10x)=33000
10(80-x)(20+x)+40(400-10x)=33000
(80-x)(20+x)+4(400-10x)=3300
1600+60x-x²+1600-40x=3300
20x-x²+3200=3300
20x-x²=100
x²-20x+100=0
(x-10)²=0
x=10
(80x200)+(80-x)(200+10x)+40(800-200-200-10x)=9000+(50x800)
(8x200)+(80-x)(20+x)+4(800-200-200-10x)=900+(5x800)
1600+(80-x)(20+x)+4(800-200-200-10x)=900+4000
(80-x)(20+x)+4(400-10x)=3300
1600+60x-x^2+1600-40x=3300
-100+20x-x^2=0
x^2-20x+100=0
(x-10)^2=0
x=10
(80-x)(200+10x)+40x(400-10x)=9000+24000
(80-x)(20+x)+40x(40-x)=900+2400
3200+60x-x^2-40x=3300
x^2-20x+100=0
(x-10)^2=0
x=10