500×0.9-(X-500)×0.8=554
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500×0.9-(X-500)×0.8=554
500×0.9-(X-500)×0.8=554
500×0.9-(X-500)×0.8=554
500×0.9-(X-500)×0.8=554
450-(X-500)×0.8=554
(X-500)×0.8=-96
X-500=-120
X=500-120
X=380
过程:450-(X-500)x0.8=554
(X-500)x0.8=-104
X-500=-130
X=500-130
X=370
500×0.9-(X-500)×0.8=554
500×0.9-0.8x+500×0.8=554
500×(0.9+0.8)-0.8x=554
850-0.8x=554
850-554=0.8x
0.8x=296
x=370
500×0.9-(X-500)×0.8=554
500-x/x=0.06
0.7x+0.9(500-X)=386
0.7x+(500-x)0.9=386 解方程
解方程.0.8+x=1.2 2.5x=10 x+0.9x=57 10x-6x解方程.0.8+x=1.2 2.5x=10x+0.9x=57 10x-6x=128
500*0.9+(x-500)*0.8=466
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