联立方程怎么解?

问题描述:

联立方程怎么解?
273/3100 + 175/1000 + x/2650 + y/2700 + 0.01 = 1
x / (x+y) = 0.36
请帮我求出X、Y 这是体积法计算配合比.请说明计算过程,

x / (x+y) = 0.36
x=0.36x+0.36y
0.64x=0.36y
x=9y/16
代入273/3100 + 175/1000 + x/2650 + y/2700 + 0.01 = 1
得:273/31+175/10+9y/(16×26.5)+y/27=99
(9*27+424)y/27*424=(310*99-2730+175*31)/310
667y/11448=33385/310
y=(33385/310)*11148/667=1799.95
代入x=9y/16=1012.47