0.3x+0.2y=1 0.1x+0.5y=1.2 怎么解 要一步步的过程
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0.3x+0.2y=1 0.1x+0.5y=1.2 怎么解 要一步步的过程
0.3x+0.2y=1 0.1x+0.5y=1.2 怎么解 要一步步的过程
0.3x+0.2y=1 0.1x+0.5y=1.2 怎么解 要一步步的过程
0.3x+0.2y=1
两边乘5
1.5x+y=5 (1)
0.1x+0.5y=1.2
两边乘2
0.2x+y=2.4 (2)
(1)-(2)
1.5x+y-0.2x-y=5-2.4
1.3x=2.6
x=2
y=2.4-0.2x=2
(1)0.3x+0.2y=1 (2)0.1x+0.5y=1.2 (1)*10,得 3x+2y=10(3) (2)*30,得 3x+15y+36(4) (4)-(3),得 3x+15y-3X-2y=26 y=2 将y=2带入(3) 3x+4=10 x=2 所以原方程解为(x=2 y=2) 用消元法更好做,当然代入法也行 多多支持啦啦,希望对你有帮助!
0.1x+0.3y = 0.15(x+y) 0.1x+0.3y+0.2×300 = 0.18×(x+y+300) x=?y=?
0.1x+0.3y = 0.15(x+y) 0.1x+0.3y+0.2×300 = 0.18×(x+y+300) x=?y=?
解方程组{0.2x+0.3y=-0.1,0.5x+(y/3)=1
解方程组:①4x+3y-5=0,x-2y-4=0.②5x-2=2(y-1),2(x-2)+(y-1)③0.2x+0.5y=0.2,0.4x+0.1y=0.4④3x-13y=-12,x+3y=2
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