这个方程怎么算,求详细的解题步骤,详细的
2个回答
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为简便, 设 X = 1000x, Y = 1000y, Z = 1000z
115X = 19000 + Y + 0.4Z .........(1)
12Y = 9000 + 5X + 0.6Z ..........(2)
6Z = 27000 + 10X + Y ............(3)
(1)+(2):
110X + 11Y = 28000 + Z
11(10X + Y) = 28000 + Z .........(4)
(4) 带入 (3)
6Z = 27000 + (28000+Z)/11
解得: Z = 5000
10X + Y = 3000
Y = 3000 - 10X ......(5)
Z=5000 和 (5) 带入 (2)
解得 X = 192
由 (5), Y = 1080
x = 0.192, y = 1.08, z = 5
115X = 19000 + Y + 0.4Z .........(1)
12Y = 9000 + 5X + 0.6Z ..........(2)
6Z = 27000 + 10X + Y ............(3)
(1)+(2):
110X + 11Y = 28000 + Z
11(10X + Y) = 28000 + Z .........(4)
(4) 带入 (3)
6Z = 27000 + (28000+Z)/11
解得: Z = 5000
10X + Y = 3000
Y = 3000 - 10X ......(5)
Z=5000 和 (5) 带入 (2)
解得 X = 192
由 (5), Y = 1080
x = 0.192, y = 1.08, z = 5
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